2027 ICD-10-CM Diagnosis Code N64.4Mastodynia
ICD-10-CM Codes›N00–N99›N60-N65›N64
- Billable — Valid for Submission
- Not Chronic
N64.4 is a billable ICD-10-CM diagnosis code for mastodynia. 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.
- Breastfeeding painful
- Cyclical mastalgia
- Generalized tenderness of breast
- Intractable breast pain
- Localized tenderness of breast
- Mastalgia of puberty
- Mastodynia of bilateral breasts
- Non-cyclical mastalgia
- Pain of breast
- Pain of left breast
- Pain of right breast
- Painful lactation
- Persistent mastalgia
- Premenstrual breast tenderness
- Tenderness of breast
- Tenderness of nipple
- Trigger point mastalgia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N64.4: 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.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name N64.4, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming N64.4: they are not reported together with it, unless the two conditions are unrelated.
- R52 Pain, unspecifiedbreast pain (N64.4)
Excludes2 3
These codes carry an Excludes2 note naming N64.4: its condition is not part of those codes, and both may be reported when the patient has both.
- G89 Pain, not elsewhere classifiedbreast pain (N64.4)
- R07 Pain in throat and chestpain in breast (N64.4)
- Block R20-R23 Symptoms and signs involving the skin and subcutaneous tissue
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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.
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 N64.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N64.4Overview
What is the ICD-10 code for mastodynia?
The ICD-10-CM code for mastodynia is N64.4 (sometimes written as N644). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N64.4 (Other disorders of breast) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report mastodynia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N64.4 group to?
When mastodynia 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 N64.4?
Under the General Equivalence Mappings, mastodynia converts to ICD-9-CM 611.71 (mastodynia). The mapping is a direct match.
