N64.4 — Mastodynia

N64.4

ICD-10 Chapter 14: Genitourinary System — illustrative image — Chapter 14: Diseases of the genitourinary system (N00–N99) — illustrative image

What this code means

Mastodynia is pain in the breast, which is commonly hormonal and cyclical.

Also called: mastodynia, breast pain.

When this code is used

Used for mastodynia.

Where it sits in ICD-10-CM

Code N64.4 belongs to Chapter 14: Diseases of the genitourinary system, which covers codes N00–N99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related anatomy

Breasts

Watch: related videos

▶ WatchBreast pain after pregnancy

Frequently asked questions

What is ICD-10-CM code N64.4?

N64.4 is the ICD-10-CM diagnosis code for “Mastodynia”. Mastodynia is pain in the breast, which is commonly hormonal and cyclical.

When is code N64.4 used?

Used for mastodynia. It belongs to Chapter 14 of ICD-10-CM (Diseases of the genitourinary system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.