ICD-10-CM 2027 diagnosis code
N65.0Deformity of reconstructed breast
N65.0 is a valid, billable ICD-10-CM code for deformity of reconstructed breast. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About N65.0
N65.0 is the ICD-10-CM diagnosis code for deformity of reconstructed breast. It belongs to category N65 (deformity and disproportion of reconstructed breast), block N60-N65 (disorders of breast) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within N65 (deformity and disproportion of reconstructed breast), N65.0 is specifically for deformity of reconstructed breast. Related codes cover disproportion of reconstructed breast (N65.1).
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.
The Medicare Code Editor expects this diagnosis only for patients age 15 through 124.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 612.0 (deformity of reconstructed breast).
Coding notes
- Contour irregularity in reconstructed breast
- Excess tissue in reconstructed breast
- Misshapen reconstructed breast
Notes that apply from higher levels
Instructions written at a parent level also apply to N65.0.
Broader instructions also apply from N60-N65 Disorders of breast and Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
6 entriesTerms in the official ICD-10-CM index that lead to N65.0.
- Complication (s) (from) (of) › reconstructed breast › deformity
- Complication (s) (from) (of) › reconstructed breast › excess tissue
- Complication (s) (from) (of) › reconstructed breast › misshappen
- Deformity › breast (acquired) › reconstructed
- Irregular, irregularity › contour, reconstructed breast
- Irregular, irregularity › reconstructed breast
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
ICD-9-CM equivalent
Converter →- 612.0Deformity of reconstructed breastexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about N65.0
Is N65.0 billable?
- Yes. N65.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N65.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N65.0 as a principal diagnosis.
Is N65.0 a CC or MCC?
- No. N65.0 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does N65.0 group to?
- N65.0 is used in the MS-DRG v44.0 logic for MS-DRG 600 (Non-Malignant Breast Disorders with CC/MCC) and MS-DRG 601 (Non-Malignant Breast Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for N65.0?
- The CMS General Equivalence Mappings map N65.0 to ICD-9-CM 612.0.