ICD-10-CM 2027
ICD-10 code for Nonpuerperal lactation
From the official ICD-10-CM alphabetic index entry “Lactation, lactating (breast) (puerperal, postpartum) › nonpuerperal”. Page updated September 29, 2026.
About coding Nonpuerperal lactation
The ICD-10-CM code for Nonpuerperal lactation is N64.3 (Galactorrhea not associated with childbirth).
Within N64 (other disorders of breast), N64.3 is specifically for Galactorrhea not associated with childbirth. Related codes cover fissure and fistula of nipple (N64.0), fat necrosis of breast (N64.1), atrophy of breast (N64.2), Mastodynia (N64.4), other signs and symptoms in breast (N64.5), other specified disorders of breast (N64.8) and disorder of breast, unspecified (N64.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 600 (Non-Malignant Breast Disorders with CC/MCC, relative weight 0.9975) and DRG 601 (Non-Malignant Breast Disorders without CC/MCC, relative weight 0.6017), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Nonpuerperal lactation ICD-10 codes
What is the ICD-10 code for Nonpuerperal lactation?
- N64.3 — Galactorrhea not associated with childbirth.
Is N64.3 billable?
- Yes. N64.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N64.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N64.3 as a principal diagnosis.
Is N64.3 a CC or MCC?
- No. N64.3 is neither a CC nor an MCC under MS-DRG v44.0.