2027 ICD-10-CM Diagnosis Code D09.20Carcinoma in situ of unspecified eye
ICD-10-CM Codes›C00–D49›D00-D09›D09
- Billable — Valid for Submission
- Chronic Condition
D09.20 is a billable ICD-10-CM diagnosis code for carcinoma in situ of unspecified eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Head and neck cancers - eye.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma in situ of choroid
- Carcinoma in situ of ciliary body
- Carcinoma in situ of conjunctiva
- Carcinoma in situ of cornea
- Carcinoma in situ of eye
- Carcinoma in situ of lacrimal drainage system
- Carcinoma in situ of lacrimal gland
- Carcinoma in situ of lacrimal gland duct
- Carcinoma in situ of nasolacrimal duct
- Carcinoma in situ of ocular adnexa
- Carcinoma in situ of retina
- Carcinoma in situ of sclera
- Carcinoma in situ of surface epithelium
- Carcinoma in situ of uveal tract
- Neoplasm of nasolacrimal duct
- Neoplasm of sclera
- OSSN - ocular surface squamous neoplasia
- Squamous cell carcinoma in situ of corneal epithelium
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to D09.20: its own notes plus those printed at D09.2, D09, block D00-D09, and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- Bowen's disease
- erythroplasia
- grade III intraepithelial neoplasia
- Queyrat's erythroplasia
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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 D09.20, its category, or a range that includes it.
Applicable To 1
These notes mention D09.20.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
Patient EducationClinical
Eye Cancer
Cancer of the eye is uncommon. It can affect the outer parts of the eye, such as the eyelid, which are made up of muscles, skin and nerves. If the cancer starts inside the eyeball it's called intraocular cancer. The most common intraocular cancers in adults are melanoma and lymphoma.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D09.20 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D09.20Overview
What is the ICD-10 code for carcinoma in situ of unspecified eye?
The ICD-10-CM code for carcinoma in situ of unspecified eye is D09.20 (sometimes written as D0920). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is D09.20 (Carcinoma in situ of eye) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of unspecified eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does D09.20 group to?
When carcinoma in situ of unspecified eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.
Can D09.20 be reported with a code from D04.1?
Not as a rule. The Excludes1 note at D09.2, which applies to D09.20, lists "carcinoma in situ of skin of eyelid (D04.1-)". 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 is the ICD-9 equivalent of D09.20?
Under the General Equivalence Mappings, carcinoma in situ of unspecified eye converts to ICD-9-CM 234.0 (ca in situ eye). The mapping is approximate, so confirm the match fits the documentation.
