2027 ICD-10-CM Diagnosis Code N64.89Other specified disorders of breast
ICD-10-CM Codes›N00–N99›N60-N65›N64
- Billable — Valid for Submission
- Not Chronic
N64.89 is a billable ICD-10-CM diagnosis code for other specified disorders of 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.
- Abnormal breast function
- Abnormal breast nipple shape
- Bilateral pendulous breasts
- Breast hematoma
- Breast hematoma due to non-traumatic cause
- Breast seroma
- Calcification of breast
- Deformity of breast
- Delayed development of the breasts
- Diabetic mastopathy
- Diffuse nodular calcifications of breast
- Finding related to development of the breasts
- Flat epithelial atypia of breast
- Friction dermatosis
- Galactocele not associated with childbirth
- Hematoma of left breast
- Hematoma of right breast
- Hyperplasia of mammary duct
- Infarction of breast
- Jogger's nipple
- Lactiferous ducts finding
- Lactocele
- Nipple deformity
- Nontraumatic hematoma of left breast
- Nontraumatic hematoma of right breast
- Obstruction of milk duct
- Occlusion of breast duct
- Occlusion of lactiferous duct of left breast
- Occlusion of lactiferous duct of right breast
- Peau d'orange surface of breast
- Pendulous breast
- Pendulous left breast
- Post-mastectomy breast deformity
- Postoperative hematoma of breast
- Postpartum subinvolution of breast
- Radial scar of breast
- Radial scar of left breast
- Radial scar of right breast
- Seroma
- Seroma following procedure
- Seroma of breast as complication of procedure
- Skin disorder of breast
- Structural abnormality of areola
- Subinvolution of breast
- Thelarche
- Traumatic hematoma of breast
- Usual ductal hyperplasia of breast
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N64.89: its own notes plus those printed at N64, block N60-N65, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Galactocele
- Subinvolution of breast (postlactational)
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.
- 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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
breast (acquired) N64.89
acquired N64.89
Disease, diseased See Also: Syndrome;
breast See Also: Disorder, breast; N64.9
specified NEC N64.89
Disorder (of) See Also: Disease;
specified type NEC N64.89
Galactocele (breast) N64.89
Hematoma (traumatic) (skin surface intact) See Also: Contusion;
breast (nontraumatic) N64.89
breast N64.89
mammary duct N64.89
Unilateral See Also: condition;
development, breast N64.89
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 N64.89 to ICD-9-CMHistory
Code HistoryHistory
Questions About N64.89Overview
What is the ICD-10 code for other specified disorders of breast?
The ICD-10-CM code for other specified disorders of breast is N64.89 (sometimes written as N6489). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N64.89 (Other specified disorders of breast) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified disorders of breast on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N64.89 group to?
When other specified disorders of 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 N64.89?
Under the General Equivalence Mappings, other specified disorders of breast converts to ICD-9-CM 611.5 (galactocele) and 611.89 (disorders breast NEC). The mapping is approximate, so confirm the match fits the documentation.
