Other disorders of breast (N64) ICD-10-CM
The N64 code range covers other disorders of breast with 16 ICD-10-CM diagnosis codes. 13 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- mechanical complication of breast prosthesis and implant T85.4
Codes in the N64 Range 16 codes · 13 billable
- N64 Other disorders of breastNon-billable
- N64.0 Fissure and fistula of nipple
- N64.1 Fat necrosis of breast
- N64.2 Atrophy of breast
- N64.3 Galactorrhea not associated with childbirth
- N64.4 Mastodynia
- N64.5 Other signs and symptoms in breastNon-billable
- N64.51 Induration of breast
- N64.52 Nipple discharge
- N64.53 Retraction of nipple
- N64.59 Other signs and symptoms in breast
- N64.8 Other specified disorders of breastNon-billable
- N64.81 Ptosis of breast
- N64.82 Hypoplasia of breast
- N64.89 Other specified disorders of breast
- N64.9 Disorder of breast, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the N64 range.
Mastectomy
Surgical procedure to remove one or both breasts.
Mastodynia
Pain in the breast generally classified as cyclical (associated with menstrual periods), or noncyclical, i.e. originating from the breast or nearby muscles or joints, ranging from minor discomfort to severely incapacitating.
Nipple Discharge
Fluid that seeps out of one or both nipples of the breast.
Seroma
Tumor-like sterile accumulation of serum in a tissue, organ, or cavity. It results from a tissue insult and is the product of tissue inflammation. It most commonly occurs following MASTECTOMY.
About the N64 Code Range
The ICD-10 code section N64 covers a variety of nonmalignant breast conditions that are not classified elsewhere, including issues affecting the nipple, breast tissue, and lactation. These codes help identify specific breast disorders such as nipple fissures, fat necrosis, and other symptoms like nipple discharge or breast pain.
This section includes codes for conditions like N64.0 (fissure and fistula of nipple), known by synonyms such as "bilateral cracked nipples" and "fissure of nipple," which document nipple lesions and cracks. N64.1 codes for fat necrosis of the breast, capturing localized breast tissue death without malignancy. Pain-related codes such as N64.4 (mastodynia) cover various types of breast pain, from cyclical tenderness to persistent mastalgia. Other notable codes include N64.52 for nipple discharge with numerous discharge types (milky, bloody, purulent) and N64.53 for nipple retraction. The section also provides codes for conditions like breast atrophy, galactorrhea unrelated to childbirth, and ptosis. When unspecified breast disorders occur, N64.9 serves as a general code for breast or nipple problems not otherwise detailed. These codes assist healthcare professionals and coders in accurately documenting diverse breast conditions and symptoms, vital for treatment and insurance purposes.
Questions About This Page
How many billable codes are in the N64 range?
Of the 16 codes in this range, 13 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the N64 range classify?
The range classifies other disorders of breast. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
