ICD-10 Code N62: Hypertrophy of breast

Key Takeaways

ICD-10 Code N62 is a billable ICD-10-CM diagnosis code for hypertrophy of breast, valid for HIPAA-covered transactions from October 1, 2025

N62 covers both female presentations (macromastia, gigantomastia, virginal breast hypertrophy) and male gynecomastia under a single code with no sub-codes

N62 has no laterality sub-codes; document unilateral versus bilateral involvement in clinical notes, not in the code itself

Pabau’s digital forms and structured clinical records help practices capture the documentation details that support accurate N62 coding and clean claim submission

Breast hypertrophy claims get denied more often than coders expect. The code itself is straightforward. The documentation behind it is where most practices fall short. ICD-10 Code N62 is a single billable code that covers every major clinical presentation of breast enlargement, from macromastia in female patients to gynecomastia in males, yet payers routinely reject claims when the supporting notes fail to establish medical necessity. This reference covers code N62 in full: definition, synonyms, documentation requirements, coding guidelines, related codes, and the errors that trigger unnecessary denials.

Accurate ICD-10 coding depends on documentation specificity that goes well beyond selecting the right code. For N62, that means recording laterality, functional impairment, patient sex, and clinical indication in the chart, even though the code itself captures none of those details in sub-codes. Understanding that gap is the difference between a clean claim and a medical necessity denial.

ICD-10 Code N62: definition and billability

ICD-10 Code N62 is the official ICD-10-CM diagnosis code for Hypertrophy of breast. It is a billable, specific code valid for HIPAA-covered transactions. The 2026 edition of ICD-10-CM N62 became effective on October 1, 2025, and it belongs to the medical billing category block N60-N65 (Other disorders of breast).

N62 is a diagnosis-type code, not a procedure code. It describes the patient’s condition for reimbursement purposes and must be paired with the appropriate CPT procedure code when a surgical or clinical intervention is being billed. According to the Centers for Medicare and Medicaid Services (CMS), N62 is valid for use in the principal or secondary diagnosis position depending on clinical context.

N62 code at a glance

Synonyms and lay terms for hypertrophy of breast

The ICD-10-CM tabular list includes several approximate synonyms for N62. Knowing them matters for two reasons: coders searching by clinical term need to arrive at the right code, and documentation using any of these terms maps to N62 for billing purposes. The CDC/NCHS ICD-10-CM web tool confirms the following synonyms are included in the official index.

• Macromastia: abnormally large breast tissue in females, often causing musculoskeletal symptoms
• Gigantomastia: severe form of macromastia with rapid or extreme breast enlargement
• Virginal breast hypertrophy: also called juvenile or pubertal macromastia; rapid enlargement during puberty
• Gynecomastia: enlarged breast tissue in males, coded under N62 regardless of underlying cause
• Large breast: lay term used by patients; maps to N62 in the ICD-10-CM index
• Breast hypertrophy: direct clinical synonym for hypertrophy of breast

All of these terms, when documented in the clinical notes and mapped through the ICD-10-CM alphabetic index, direct the coder to N62. None of the subtypes has its own separate code.

Clinical overview: presentations coded under N62

N62 applies across a range of clinical presentations. The common thread is excess breast tissue volume, whether in a female or male patient, whether congenital, hormonal, or idiopathic in origin.

Female patients: Macromastia presents with breast tissue disproportionate to body frame, often producing chronic back and neck pain, skin breakdown in the inframammary fold, difficulty with physical activity, and significant psychological impact. Gigantomastia refers to severe, sometimes rapidly progressive enlargement. Virginal breast hypertrophy appears in adolescent females, typically without an identified hormonal driver, and may require early surgical intervention.

Male patients: Gynecomastia involves glandular breast tissue enlargement in males and is distinct from pseudogynecomastia, which involves fat deposition without true glandular proliferation. The distinction matters clinically and for medical billing compliance, since pseudogynecomastia does not carry an ICD-10 code that maps to N62.

Functional impairment is the key documentation factor for insurance coverage. Payers routinely require evidence that the condition causes physical symptoms, such as intertrigo, chronic pain, nerve impingement, or restriction of daily activities, before approving surgical intervention.

N62 documentation requirements

N62 is a single code with no laterality sub-codes and no sub-categories by sex or subtype. That simplicity at the code level places the documentation burden entirely on the clinical note. Payers assess medical necessity through the chart, not through code refinements that do not exist. Practices using digital intake and clinical forms can structure N62 documentation into the consultation workflow so nothing is omitted.

The following checklist covers what providers must include in the medical record to support N62:

• Clinical indication: the reason the patient presented, including symptoms and duration
• Laterality: specify unilateral (left or right) or bilateral; this does not change the code but must appear in the note for insurer review
• Patient sex: relevant for gynecomastia documentation in male patients and for distinguishing from other breast disorders
• Subtype (where applicable): gigantomastia, virginal hypertrophy, or gynecomastia if clinically distinguished
• Functional impairment: documented physical symptoms such as chronic back pain, shoulder grooving, skin breakdown (intertrigo), rash, or restriction of activity
• Surgical intent (if relevant): if the visit is pre-surgical, note that the evaluation is for planned reduction mammoplasty or gynecomastia excision
• Conservative treatment history: many payers require documentation that conservative management (physiotherapy, weight loss, supportive garments) was attempted before approving surgery
• Associated symptoms: note pain scores, posture changes, or psychological impact where relevant to medical necessity

N62 coding guidelines

The ICD-10-CM Official Guidelines for Coding and Reporting and revenue cycle management principles both apply to N62. Key rules for coders:

Gynecomastia and N62: coding for male patients

The ICD-10 code for gynecomastia is N62. Male patients with gynecomastia use the same code as female patients with macromastia. There is no sex-specific sub-code. Coders must rely on the provider’s documentation to confirm the diagnosis is true gynecomastia (glandular tissue) rather than pseudogynecomastia (adipose tissue only). Pseudogynecomastia is not coded under N62; use the appropriate obesity or lipomatous tissue code instead. According to the AAPC ICD-10-CM code set, N62 is the designated code for gynecomastia without further specification.

Macromastia, gigantomastia, and virginal breast hypertrophy

All three subtypes map to N62. Gigantomastia is not assigned a higher severity code; it remains N62 regardless of how extreme the presentation. Virginal (juvenile) breast hypertrophy, confirmed as an approximate synonym in the ICD-10-CM official tabular, is also N62. Coders should document the specific subtype in the note for clinical context, but the code does not change.

Laterality in N62

N62 has no laterality sub-codes. Unlike many musculoskeletal and breast disorder codes in ICD-10-CM that distinguish left, right, and bilateral, N62 is a single-code category. The coder cannot capture laterality through the code. It must be in the clinical note. This is a frequent documentation gap that reviewers notice during pre-authorization or audit.

Related ICD-10 codes

N62 sits within the N60-N65 block. Knowing adjacent codes prevents miscoding and supports accurate denial management when a claim is returned for code clarification.

When a patient with macromastia also presents with inframammary intertrigo (L30.4), both codes are reported if both conditions are documented and treated during the encounter. See related guidance on ICD-10 multi-code encounters for sequencing principles.

Associated CPT codes for breast hypertrophy

N62 is a diagnosis code; it pairs with CPT procedure codes when a surgical or clinical intervention is billed. The following CPT codes are commonly used with N62, though payer-specific coverage policies must be verified before submission. Use a structured superbill to track CPT-to-ICD-10 pairings consistently across encounters.

CPT code pairings listed here are common in clinical practice but are not guaranteed coverage decisions. Individual payer policies and local coverage determinations (LCDs) govern reimbursement. Practices billing through Pabau’s integration with Claim.MD electronic claims clearinghouse benefit from real-time eligibility checks and claim validation before submission, reducing the risk of N62-paired claim denials.

Common coding errors and how to avoid them

This section covers the errors that produce unnecessary denials on N62 claims. Competitors in this space list coding guidelines; few enumerate the specific mistakes that coders and practices repeat. These are the most frequent.

Error 1: Missing functional impairment documentation

Insurers treat reduction mammoplasty as cosmetic unless the chart demonstrates functional impairment. Submitting N62 with CPT 19318 without documented physical symptoms is the fastest route to a medical necessity denial. Fix: use a structured documentation template that prompts clinicians to record pain scores, posture findings, skin breakdown, and activity limitations at every N62 encounter.

Error 2: Coding pseudogynecomastia as N62

Pseudogynecomastia, fat deposition in the male chest without glandular proliferation, does not map to N62. Using N62 for a patient whose provider documented “chest fat” or “lipomatous tissue” without confirming true gynecomastia creates a documentation-to-code mismatch. Auditors and payers flag this during review. Fix: confirm the provider explicitly documented glandular breast tissue in the note before assigning N62 for male patients.

Error 3: Omitting laterality from the clinical record

N62 has no sub-codes for left, right, or bilateral. Coders sometimes assume that because the code does not require laterality, they do not need to document it. Payers conducting medical necessity reviews want to know which side was treated and why. Unilateral gynecomastia, for example, raises different clinical questions than bilateral macromastia. Fix: build laterality into every N62 documentation template. Pabau’s claims management software supports the clean claim requirements that include thorough diagnosis documentation.

Error 4: Using N63 instead of N62 for diffuse hypertrophy

N63 (unspecified lump in breast) applies to a discrete, localized mass. Diffuse breast enlargement is N62. When providers document “palpable mass” without clarifying whether the presentation is focal or diffuse, coders sometimes default to N63. Fix: return the note to the provider for clarification before assigning the code. The distinction affects both the code and the clinical picture the insurer evaluates.

Reduce coding errors with structured clinical documentation

Pabau’s digital forms and clinical records help plastic surgery and aesthetic practices capture the specific documentation details payers require for N62 claims, from functional impairment to laterality and surgical intent.

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How Pabau supports accurate N62 documentation

Accurate ICD-10 Code N62 claims start with structured clinical notes, not with the billing department. When the documentation is complete and specific, coding is straightforward. When notes are vague, every downstream step gets harder.

Pabau’s structured client records allow plastic surgery and aesthetic medicine practices to build N62-specific documentation into consultation templates, capturing laterality, functional impairment scores, conservative treatment history, and surgical intent as structured fields rather than free-text afterthoughts. The result is notes that satisfy payer documentation requirements before the claim is submitted.

For practices billing N62-paired procedures, Pabau’s integration with medical claims clearinghouses enables electronic submission with real-time eligibility verification, helping practices identify coverage issues before the patient’s procedure date rather than after a denial arrives. This is particularly relevant for plastic surgery practices where N62 is a high-frequency diagnosis code across both aesthetic and reconstructive case mixes.

Conclusion

ICD-10 Code N62 is a single billable code covering every clinical presentation of breast hypertrophy, from macromastia and gigantomastia in female patients to gynecomastia in males. The code is straightforward. What determines whether claims are paid is the documentation behind it. Laterality, functional impairment, patient sex, and clinical indication must all be in the chart, even though none appear in sub-codes.

Pabau helps plastic surgery and aesthetic medicine practices build that documentation discipline into daily workflows, so N62-paired claims arrive at the clearinghouse complete and clean. To see how Pabau handles clinical documentation and revenue cycle workflows for procedure-heavy practices, book a demo.

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