2027 ICD-10-CM Diagnosis Code C79.2Secondary malignant neoplasm of skin
ICD-10-CM Codes›C00–D49›C76-C80›C79
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 18
- Chronic Condition
ICD-10-CM C79.2
C79.2 is a billable ICD-10-CM diagnosis code for secondary malignant neoplasm of skin. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 582 through 583, 597 through 599. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 20 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Secondary malignancies.
For Medicare Advantage risk adjustment, C79.2 maps to CMS-HCC Category 18 (Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid) under the V28 model, adding a risk factor of about 2.341 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
ICD-10-CM Code
C79.2
Billable Status
Yes — Valid for Submission
Code Describes
Secondary malignant neoplasm of skin
Short Description
Secondary malignant neoplasm of skin
Same as the full description in the CMS dataset.
Code Classification
Medicare Risk Adjustment (HCC)Billing
C79.2 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
CMS-HCC V28 Category (Payment Model)
HCC 18— Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid
Payment HCC · PY 2027 one of 26 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+2.341
community, non-dual, aged · ranges 1.110–2.537 across segments
Hierarchy
Superseded by HCC 17
a more severe related category takes the payment when both are reported
Prior Model (CMS-HCC V24)
HCC 10
V24 retired V28 pays 100% of MA risk scores since PY 2026
Other CMS Models
PACE (CMS-HCC V22): HCC 10 · ESRD (V21): HCC 10 · ESRD (V24): HCC 10
ESRD V21 weights: 0.136 dialysis, 0.451–0.668 functioning graft · ESRD V24 weights: 0.111 dialysis, 0.467–0.780 functioning graft
Part D (RxHCC)
RxHCC 18 — Secondary Cancer of Lung, Liver, Brain, and Other Sites
also risk-adjusts in the Part D prescription drug model (V08)
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acantholytic squamous cell carcinoma of skin
- Amelanotic malignant melanoma of skin
- Basosquamous carcinoma of skin
- Clear cell squamous cell carcinoma of skin
- Leukemic infiltration of skin
- Malignant infiltration of skin by underlying neoplasm
- Malignant melanoma of unknown origin
- Malignant neoplasm of bone, connective tissue, skin and breast
- Malignant neoplasm of scalp
- Malignant neoplasm of skin of abdominal wall
- Malignant neoplasm of skin of cheek, external
- Malignant neoplasm of skin of external auditory meatus
- Malignant neoplasm of skin of forearm
- Malignant neoplasm of skin of lower leg
- Malignant neoplasm of skin of popliteal fossa area
- Malignant neoplasm of skin of temple
- Malignant neoplasm of skin of upper arm
- Malignant neoplasm of soft tissue of axilla
- Malignant neoplasm of soft tissue of buttock
- Malignant neoplasm of soft tissue of toe
- Malignant neoplasm of soft tissue of wrist
- Malignant neoplasm of tarsus of eyelid
- Malignant neoplasm of unknown origin
- Metastatic acantholytic squamous cell carcinoma
- Metastatic acantholytic squamous cell carcinoma to skin
- Metastatic adenocarcinoma to Moll's gland
- Metastatic adenocarcinoma to skin
- Metastatic amelanotic malignant melanoma to skin
- Metastatic basal cell carcinoma
- Metastatic basosquamous cell carcinoma to skin
- Metastatic carcinoma to bone, connective tissue, skin and breast
- Metastatic carcinoma to breast
- Metastatic carcinoma to meibomian gland
- Metastatic carcinoma to skin
- Metastatic carcinoma to skin of head
- Metastatic carcinoma to skin of lower limb
- Metastatic carcinoma to skin of neck
- Metastatic carcinoma to skin of trunk
- Metastatic carcinoma to skin of upper limb
- Metastatic ceruminous adenocarcinoma to skin
- Metastatic clear cell squamous cell carcinoma to skin
- Metastatic malignant melanoma to skin
- Metastatic malignant neoplasm to adnexa of skin
- Metastatic malignant neoplasm to axilla
- Metastatic malignant neoplasm to cheek
- Metastatic malignant neoplasm to conjunctiva
- Metastatic malignant neoplasm to forearm
- Metastatic malignant neoplasm to hand
- Metastatic malignant neoplasm to inguinal region
- Metastatic malignant neoplasm to lower leg
- Metastatic malignant neoplasm to nose
- Metastatic malignant neoplasm to perianal skin
- Metastatic malignant neoplasm to sebaceous gland
- Metastatic malignant neoplasm to skin
- Metastatic malignant neoplasm to skin of abdomen
- Metastatic malignant neoplasm to skin of ankle
- Metastatic malignant neoplasm to skin of axilla
- Metastatic malignant neoplasm to skin of back
- Metastatic malignant neoplasm to skin of breast
- Metastatic malignant neoplasm to skin of buttock
- Metastatic malignant neoplasm to skin of cheek
- Metastatic malignant neoplasm to skin of chest
- Metastatic malignant neoplasm to skin of chin
- Metastatic malignant neoplasm to skin of ear
- Metastatic malignant neoplasm to skin of elbow
- Metastatic malignant neoplasm to skin of external auditory canal
- Metastatic malignant neoplasm to skin of eyebrow
- Metastatic malignant neoplasm to skin of eyelid
- Metastatic malignant neoplasm to skin of face
- Metastatic malignant neoplasm to skin of finger
- Metastatic malignant neoplasm to skin of foot
- Metastatic malignant neoplasm to skin of forearm
- Metastatic malignant neoplasm to skin of forehead
- Metastatic malignant neoplasm to skin of groin
- Metastatic malignant neoplasm to skin of hand
- Metastatic malignant neoplasm to skin of head
- Metastatic malignant neoplasm to skin of hip
- Metastatic malignant neoplasm to skin of hip and skin of lower leg
- Metastatic malignant neoplasm to skin of knee
- Metastatic malignant neoplasm to skin of lip
- Metastatic malignant neoplasm to skin of lower leg
- Metastatic malignant neoplasm to skin of lower limb
- Metastatic malignant neoplasm to skin of neck
- Metastatic malignant neoplasm to skin of nose
- Metastatic malignant neoplasm to skin of perineum
- Metastatic malignant neoplasm to skin of popliteal area
- Metastatic malignant neoplasm to skin of scalp
- Metastatic malignant neoplasm to skin of shoulder
- Metastatic malignant neoplasm to skin of temporal region
- Metastatic malignant neoplasm to skin of thigh
- Metastatic malignant neoplasm to skin of toe
- Metastatic malignant neoplasm to skin of trunk
- Metastatic malignant neoplasm to skin of umbilicus
- Metastatic malignant neoplasm to skin of upper arm
- Metastatic malignant neoplasm to skin of upper limb
- Metastatic malignant neoplasm to skin of wrist
- Metastatic malignant neoplasm to soft tissue of back
- Metastatic malignant neoplasm to soft tissues of axilla
- Metastatic malignant neoplasm to soft tissues of buttock
- Metastatic malignant neoplasm to soft tissues of hip
- Metastatic malignant neoplasm to soft tissues of neck
- Metastatic malignant neoplasm to soft tissues of perineum
- Metastatic malignant neoplasm to soft tissues of shoulder
- Metastatic malignant neoplasm to sweat gland
- Metastatic malignant neoplasm to thigh
- Metastatic malignant neoplasm to upper arm
- Metastatic Merkel cell carcinoma to skin
- Metastatic mucoepidermoid carcinoma to skin
- Metastatic plantar verrucous carcinoma
- Metastatic small cell neuroendocrine carcinoma
- Metastatic squamous cell carcinoma to skin
- Mucoepidermoid carcinoma of skin
- Neoplasm of skin of ankle
- Neoplasm of skin of axilla
- Neoplasm of skin of buttock
- Neoplasm of skin of elbow
- Neoplasm of skin of eyebrow
- Neoplasm of skin of finger
- Neoplasm of skin of forearm
- Neoplasm of skin of groin
- Neoplasm of skin of lower leg
- Neoplasm of skin of popliteal area
- Neoplasm of skin of thigh
- Neoplasm of skin of toe
- Neoplasm of skin of umbilicus
- Neoplasm of skin of upper arm
- Neoplasm of skin of wrist
- Plantar verrucous carcinoma
- Sarcomatous metastasis in skin
- Small cell carcinoma metastatic to skin
- Squamous cell carcinoma of foot
- T-cell leukemic infiltration of skin
- Tumor invades dermis
- Tumor invades skin
- Tumor invasion limited to skin
- Tumor of unknown origin
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to C79.2: its own notes plus those printed at C79 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
On C79.2 itself
- secondary Merkel cell carcinoma (C7B.1)
Notes
General instructions on how these codes are used.
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name C79.2, its category, or a range that includes it.
Applicable To 2
These notes mention C79.2.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
CCSR NEO070
Secondary malignancies
Default principal diagnosis: inpatient Yes · outpatient Yes
Clinical InformationClinical
Metastatic Malignant Neoplasm in the Skin|Metastatic Malignant Neoplasm to the Skin
the spread of a malignant neoplasm to the skin. this may be from a primary skin malignant neoplasm, or from a malignant neoplasm at a distant site.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| abdomen, abdominal › wall [See Also: Neoplasm, abdomen, wall, skin] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| ala nasi (external) [See Also: Neoplasm, skin, nose] | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| anus, anal › margin [See Also: Neoplasm, anus, skin] | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| anus, anal › skin | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| auditory › canal (external) (skin) | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| auricle, ear [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| auricular canal (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| axilla, axillary › fold [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| breast (connective tissue) (glandular tissue) (soft parts) › mastectomy site (skin) [See Also: Neoplasm, breast, skin] | C44.501 | C79.2 | – | – | – | – |
| breast (connective tissue) (glandular tissue) (soft parts) › skin | C44.501 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| brow | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| canal › auditory (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| canal › auricular (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| canthus (eye) (inner) (outer) | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| cheek › external | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| chin | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| columnella [See Also: Neoplasm, skin, face] | C44.390 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| concha [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| connective tissue NEC › skin (dermis) NEC [See Also: Neoplasm, skin, by site] | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] › auricle or auris [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] › canal, external [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] › external meatus [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] › lobule [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| ear (external) [See Also: Neoplasm, skin, ear] › skin | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| earlobe | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| external › meatus (ear) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| eyebrow | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| forehead (skin) | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| helix [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| jaw › skin [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| lid (lower) (upper) | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| lip › skin (commissure) (lower) (upper) | C44.00 | C79.2 | D04.0 | D23.0 | D48.5 | D49.2 |
| mastectomy site (skin) [See Also: Neoplasm, breast, skin] | C44.501 | C79.2 | – | – | – | – |
| meatus external (ear) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| meibomian gland | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| nail [See Also: Neoplasm, skin, limb] | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| nail [See Also: Neoplasm, skin, limb] › finger [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| nail [See Also: Neoplasm, skin, limb] › toe [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| nasolabial groove [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| nates [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| nose, nasal › ala (external) (nasi) [See Also: Neoplasm, nose, skin] | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| nose, nasal › external (skin) [See Also: Neoplasm, nose, skin] | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| nose, nasal › skin | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| palpebra | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| perianal (skin) [See Also: Neoplasm, anus, skin] | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| pinna (ear) NEC [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| scalp | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| scar NEC [See Also: Neoplasm, skin, by site] | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| skin NOS | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| skin NOS › abdominal wall | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › ala nasi [See Also: Neoplasm, nose, skin] | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › ankle [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › antecubital space [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › anus | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › arm [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › auditory canal (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › auricle (ear) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › auricular canal (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › axilla, axillary fold [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › back [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › breast | C44.501 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › brow [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › buttock [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › calf [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › canthus (eye) (inner) (outer) | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| skin NOS › cervical region [See Also: Neoplasm, skin, neck] | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| skin NOS › cheek (external) [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › chest (wall) [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › chin [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › clavicular area [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › columnella [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › concha [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › ear (external) | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › elbow [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › eyebrow [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › eyelid | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| skin NOS › face NOS | C44.300 | C79.2 | D04.30 | D23.30 | D48.5 | D49.2 |
| skin NOS › finger [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › flank [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › foot [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › forearm [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › forehead [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › glabella [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › gluteal region [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › groin [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › hand [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › head NEC [See Also: Neoplasm, skin, scalp] | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| skin NOS › heel [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › helix [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › hip [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › infraclavicular region [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › inguinal region [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › jaw [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › knee [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › leg [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › lid (lower) (upper) | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| skin NOS › limb NEC | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| skin NOS › limb NEC › lower | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › limb NEC › upper | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › lip (lower) (upper) | C44.00 | C79.2 | D04.0 | D23.0 | D48.5 | D49.2 |
| skin NOS › mastectomy site (skin) [See Also: Neoplasm, skin, breast] | C44.501 | C79.2 | – | – | – | – |
| skin NOS › meatus, acoustic (external) [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › nates [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › neck | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| skin NOS › nose (external) [See Also: Neoplasm, nose, skin] | C44.301 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › palm [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › palpebra | C44.10 | C79.2 | D04.1 | D23.1 | D48.5 | D49.2 |
| skin NOS › perianal [See Also: Neoplasm, skin, anus] | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › perineum [See Also: Neoplasm, skin, anus] | C44.500 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › pinna [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › plantar [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › popliteal fossa or space [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › pubes [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › sacrococcygeal region [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › scalp | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| skin NOS › scapular region [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › shoulder [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › sole (foot) [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › specified sites NEC | C44.80 | C79.2 | D04.8 | D23.9 | D48.5 | D49.2 |
| skin NOS › submammary fold [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › supraclavicular region [See Also: Neoplasm, skin, neck] | C44.40 | C79.2 | D04.4 | D23.4 | D48.5 | D49.2 |
| skin NOS › temple [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| skin NOS › thigh [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › thoracic wall [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › thumb [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| skin NOS › toe [See Also: Neoplasm, skin, limb, lower] | C44.70 | C79.2 | D04.7 | D23.7 | D48.5 | D49.2 |
| skin NOS › tragus [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| skin NOS › trunk | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › umbilicus [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
| skin NOS › wrist [See Also: Neoplasm, skin, limb, upper] | C44.60 | C79.2 | D04.6 | D23.6 | D48.5 | D49.2 |
| sudoriferous, sudoriparous gland, site unspecified | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| sweat gland (apocrine) (eccrine), site unspecified | C44.90 | C79.2 | D04.9 | D23.9 | D48.5 | D49.2 |
| temple (skin) [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| temporal › region › skin [See Also: Neoplasm, skin, face] | C44.309 | C79.2 | D04.39 | D23.39 | D48.5 | D49.2 |
| tragus [See Also: Neoplasm, skin, ear] | C44.20 | C79.2 | D04.2 | D23.2 | D48.5 | D49.2 |
| umbilicus, umbilical [See Also: Neoplasm, skin, trunk] | C44.509 | C79.2 | D04.5 | D23.5 | D48.5 | D49.2 |
Patient EducationClinical
Skin Cancer
Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C79.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.
Questions About C79.2Overview
What is the ICD-10 code for secondary malignant neoplasm of skin?
The ICD-10-CM code for secondary malignant neoplasm of skin is C79.2 (sometimes written as C792). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is C79.2 (Secondary malignant neoplasm of other and unspecified sites) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report secondary malignant neoplasm of skin on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does C79.2 group to?
When secondary malignant neoplasm of skin is the principal diagnosis on an inpatient stay, it groups to MS-DRG 598, 582, 599, 597, 583, with relative weights from 0.6756 to 1.8014 depending on complications. Higher weights mean higher Medicare reimbursement.
Is C79.2 a CC or MCC?
CMS lists C79.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 20 closely related codes in its exclusion list.
Can C79.2 be reported with C7B.1?
Not as a rule. The Excludes1 note on C79.2 lists "secondary Merkel cell carcinoma (C7B.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is C79.2?
C79.2 (secondary malignant neoplasm of skin) maps to CMS-HCC Category 18 (Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid), commonly written as HCC 18, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 10 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 18.
Does C79.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, C79.2 adds a risk adjustment factor of about 2.341 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 1.110 to 2.537 depending on the payment segment). A more severe related category (HCC 17) supersedes it when both are reported. See the full factor table on the HCC 18 category page.
