2026 ICD-10-CM Diagnosis Code N62Hypertrophy of breast

ICD-10-CM Codes›N00–N99›N60-N65›N62

ICD-10-CM N62
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N62 is a billable ICD-10-CM diagnosis code for hypertrophy of 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
N62
Billable Status
Yes — Valid for Submission
Code Describes
Hypertrophy of breast
Chapter
N60-N65
Disorders of breast

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN62Hypertrophy of breast
This CodeN62Hypertrophy of breast

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormally short little finger
  • Atypical ductal hyperplasia of breast
  • Atypical hyperplasia of breast
  • Atypical lobular hyperplasia of breast
  • Breast lobule hyperplasia
  • Familial juvenile hypertrophy of breast
  • Finding related to development of the breasts
  • Gigantomastia
  • Gynecomastia
  • Gynecomastia caused by drug
  • Gynecomastia caused by human chorionic gonadotrophin
  • Hyperplasia of mammary duct
  • Hypertrophy of breast
  • Hypertrophy of gland of Montgomery
  • Hypoplasia of distal phalanx of foot
  • Idiopathic gynecomastia
  • Infantile breast hypertrophy
  • Large breast
  • Mammary digital nail syndrome
  • Massive pubertal hypertrophy of breast
  • Overdeveloped breasts
  • Pseudoangiomatous stromal hyperplasia of breast
  • Pubertal breast hypertrophy
  • Pubertal gynecomastia
  • Size of breast - finding
  • Thelarche

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Gynecomastia
  • Hypertrophy of breast NOS
  • Massive pubertal hypertrophy of breast

Type 1 Excludes

  • breast engorgement of newborn P83.4
  • disproportion of reconstructed breast N65.1

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Excess, excessive, excessively
      • development, breast
    • Gynecomastia
    • Hyperplasia, hyperplastic
      • epithelial
        • nipple
    • Hypertrophy, hypertrophic
      • breast
    • Hypertrophy, hypertrophic
      • breast
        • pubertal, massive
    • Hypertrophy, hypertrophic
      • breast
        • senile (parenchymatous)
    • Hypertrophy, hypertrophic
      • nipple
    • Mammoplasia
    • Mastoplasia, mastoplastia

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Gynecomastia

    enlargement of the breast in the males, caused by an excess of estrogens. physiological gynecomastia is normally observed in newborns; adolescent; and aging males.

  • Gynecomastia, CTCAE|Gynecomastia|Gynecomastia|Gynecomastia (Priority 2)|Gynecomastia, CTCAE 5.0

    a disorder characterized by excessive development of the breasts in males.

  • 17-Beta-Hydroxysteroid Dehydrogenase 3 Deficiency|17 Beta HSD3 Deficiency|17 beta HSD3 Deficiency|Pseudohermaphroditism, Male, with Gynecomastia

    decreased activity of the steroidogenic enzyme, 17-beta-hydroxysteroid dehydrogenase, associated with mutation(s) in the hsd17b3 gene, leading to reduced testosterone production.

  • Grade 1 Gynecomastia, CTCAE|Grade 1 Gynecomastia

    asymptomatic

  • Grade 2 Gynecomastia, CTCAE|Grade 2 Gynecomastia|Grade 2 Gynecomastia

    symptomatic (e.g., pain or psychosocial impact)

  • Grade 3 Gynecomastia, CTCAE|Grade 3 Gynecomastia|Grade 3 Gynecomastia

    severe symptoms; elective operative intervention indicated

  • Gynecomastia

    a non-neoplastic focal or diffuse proliferation of glandular tissue of breast in males.

  • Gynecomastia, CTCAE 5.0|Gynecomastia|Gynecomastia|Gynecomastia (Priority 2)

    a disorder characterized by excessive development of the breasts in males.

  • Pathological Gynecomastia

    gynecomastia that is due to exogenous substances or disease processes.

  • Pubertal Gynecomastia|Transient Gynecomastia|Transient Gynecomastia

    gynecomastia that occurs during puberty and is not due to exogenous substances or disease processes.

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 N62 to ICD-9-CMHistory

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

ICD-9-CM
611.1 Hypertrophy of breast
Exact Match The mapping is direct, with no qualifiers.

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 N62Overview

Is N62 (Hypertrophy of breast) a billable code?

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

What MS-DRG does N62 group to?

When hypertrophy of 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 N62?

Under the General Equivalence Mappings, hypertrophy of breast converts to ICD-9-CM 611.1 (hypertrophy of breast). The mapping is a direct match.

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.