ICD-10 Code N63.42

Unspecified lump in left breast, subareolar

Diagnosis Code N63.42

ICD-10: N63.42
Short Description: Unspecified lump in left breast, subareolar
Long Description: Unspecified lump in left breast, subareolar
Version 2019 of the ICD-10-CM diagnosis code N63.42

Valid for Submission
The code N63.42 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the genitourinary system (N00–N99)
    • Disorders of breast (N60-N65)
      • Unspecified lump in breast (N63)
Version 2019 Billable Code

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code N63.42 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)

  • 597 - MALIGNANT BREAST DISORDERS WITH MCC
  • 598 - MALIGNANT BREAST DISORDERS WITH CC
  • 599 - MALIGNANT BREAST DISORDERS WITHOUT CC/MCC
  • 600 - NON-MALIGNANT BREAST DISORDERS WITH CC/MCC
  • 601 - NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC

Convert to ICD-9
  • 611.72 - Lump or mass in breast (Approximate Flag)

Index to Diseases and Injuries
References found for the code N63.42 in the Index to Diseases and Injuries:


Replacement Code
This code replaces the following previously assigned ICD-10 code(s) listed below:
  • N63 - Unspecified lump in breast


ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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