2027 ICD-10-CM Diagnosis Code N64.59Other signs and symptoms in breast
ICD-10-CM Codes›N00–N99›N60-N65›N64
- Billable — Valid for Submission
- Not Chronic
N64.59 is a billable ICD-10-CM diagnosis code for other signs and symptoms in breast. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 600 through 601. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonmalignant breast conditions.
This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such lump in breast and other disorders of the breast.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Absent nipple
- Areolas unequal in size
- Bilateral changes in skin of breasts
- Bilateral inversion of nipple
- Bleeding from breast
- Bleeding from nipple
- Bleeding of surface of nipple
- Breast asymmetry in adolescence
- Breast changes
- Breast cold
- Breast depigmented
- Breast disc palpable
- Breast hot
- Breast hypopigmented
- Breast pigmented
- Breast signs and symptoms
- Breast symptom of change in nipple
- Breast symptom of change in skin
- Breast temperature - finding
- Breasts asymmetrical
- Chest swelling
- Complex sclerosing lesion of breast
- Complex sclerosing lesion of left breast
- Complex sclerosing lesion of right breast
- Contour of breast distorted
- Deformation of breast
- Destructive lesion of nipple
- Dimpling of surface of breast
- Discoloration of nipple
- Discoloration of skin of breast
- Displacement of nipple
- Edema of breast
- Edema of nipple
- Engorgement of breasts
- Finding of color of breast
- Finding of color of nipple
- Finding of consistency of breast
- Finding of flow of breast milk
- Finding of measures of lactation
- Finding of proportion of nipple
- Finding of quantity of lactation
- Finding of sensation of nipple
- Flat nipple
- Hair sinus
- Hair sinus of breast
- Increase in surface veins of breast
- Induration of breast
- Induration of left breast
- Induration of right breast
- Inversion of left nipple
- Inversion of nipple
- Inversion of right nipple
- Lactiferous duct palpable
- Lactiferous duct prominent
- Lactiferous ducts finding
- Large areola
- Large nipple
- Lesion of left nipple
- Lesion of nipple
- Lesion of right nipple
- Milk leaking from breast
- Nipple bleeding
- Nipple deformity
- Nipple depigmented
- Nipple hypopigmented
- Nipples unequal in size
- Position of nipple - finding
- Red breast
- Red nipple
- Retraction of skin of breast
- Rippling of surface of breast associated with prosthetic breast implant
- Shape of breasts unequal
- Sinus of breast
- Size of breast - finding
- Size of breasts unequal
- Size of nipple - finding
- Small breast
- Small nipple
- Soft breast
- Sore nipple
- Surface characteristics of breast - finding
- Swelling of breast
- Swelling of nipple
- Symmetry of breasts - finding
- Thickening of skin
- Thickening of skin of breast
- Veins visible on breast
- Wide spaced nipples
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N64.59: its own notes plus those printed at N64.5, N64, block N60-N65, and Chapter 14. 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.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- abnormal findings on diagnostic imaging of breast (R92.-)
- mechanical complication of breast prosthesis and implant (T85.4-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name N64.59, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming N64.59: its condition is not part of those codes, and both may be reported when the patient has both.
- Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedsigns and symptoms of breast (N63, N64.5) names N64.5, which includes this code
- Block R20-R23 Symptoms and signs involving the skin and subcutaneous tissue
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
breast N64.59
breast N64.59
breast NEC N64.59
breast N64.59
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Breast Diseases
Breast diseases include various conditions and changes in your breast. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges of fluids that are not breast milk.
The full article covers:
- What are breast diseases?
- What are the symptoms of breast disease?
- How are breast diseases diagnosed?
- What are the treatments for breast disease?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert N64.59 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N64.59Overview
What is the ICD-10 code for other signs and symptoms in breast?
The ICD-10-CM code for other signs and symptoms in breast is N64.59 (sometimes written as N6459). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N64.59 (Other signs and symptoms in breast) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other signs and symptoms in breast on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N64.59 group to?
When other signs and symptoms in breast is the principal diagnosis on an inpatient stay, it groups to MS-DRG 600, 601, with relative weights from 0.6014 to 0.9971 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of N64.59?
Under the General Equivalence Mappings, other signs and symptoms in breast converts to ICD-9-CM 611.79 (symptoms in breast NEC). The mapping is approximate, so confirm the match fits the documentation.
