2026 ICD-10-CM Diagnosis Code N60.91Unspecified benign mammary dysplasia of right breast

ICD-10-CM Codes›N00–N99›N60-N65›N60

ICD-10-CM N60.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N60.91 is a billable ICD-10-CM diagnosis code for unspecified benign mammary dysplasia of right breast. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 600 through 601. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonmalignant breast conditions.

Code Identity

ICD-10-CM Code
N60.91
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified benign mammary dysplasia of right breast
Short Description
Unspecified benign mammary dysplasia of right breast
Same as the full description in the CMS dataset.
Parent Code
N60.9
Unspecified benign mammary dysplasia

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN60Benign mammary dysplasia
This CodeN60.91Unspecified benign mammary dysplasia of right breast

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Atypical ductal hyperplasia of breast
  • Atypical ductal hyperplasia of left breast
  • Atypical ductal hyperplasia of right breast
  • Atypical hyperplasia of breast
  • Atypical lobular hyperplasia of breast
  • Atypical lobular hyperplasia of left breast
  • Atypical lobular hyperplasia of right breast
  • Benign mammary dysplasia of left breast
  • Benign mammary dysplasia of right breast
  • Bilateral atypical ductal hyperplasia of breasts
  • Bilateral atypical lobular hyperplasia of breasts
  • Bilateral benign mammary dysplasia
  • Bilateral lactiferous ductal hyperplasia of breasts
  • Hyperplasia of lactiferous duct of left breast
  • Hyperplasia of lactiferous duct of right breast
  • Hyperplasia of mammary duct

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN017
Nonmalignant breast conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

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 N60.91 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
610.9 Benign mamm dysplas NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N60.91Overview

Is N60.91 (Unspecified benign mammary dysplasia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified benign mammary dysplasia of right breast on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N60.91 group to?

When unspecified benign mammary dysplasia of right breast is the principal diagnosis on an inpatient stay, it groups to MS-DRG 600, 601, with relative weights from 0.6050 to 1.0416 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N60.91?

Under the General Equivalence Mappings, unspecified benign mammary dysplasia of right breast converts to ICD-9-CM 610.9 (benign mamm dysplas NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.