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ICD-10-CM 2027 diagnosis code

N99.861Intraoperative and postprocedural nipple necrosis

✓ Billable / specificNew for 2027

N99.861 is a valid, billable ICD-10-CM code for intraoperative and postprocedural nipple necrosis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N99.861

N99.861 is the ICD-10-CM diagnosis code for intraoperative and postprocedural nipple necrosis. It belongs to category N99 (intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified), block N99 (intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified) 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 N99.86 (intraoperative and postprocedural complications and disorders of breast), N99.861 is specifically for intraoperative and postprocedural nipple necrosis. Related codes cover ischemia (N99.860).

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.

It was added in FY2027, effective October 1, 2026.

Notes that apply from higher levels

Instructions written at a parent level also apply to N99.861.

› From N99 Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
Excludes2
  • irradiation cystitis (N30.4-)
  • postoophorectomy osteoporosis with current pathological fracture (M80.8-)
  • postoophorectomy osteoporosis without current pathological fracture (M81.8)

Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to N99.861.

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

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2027 (effective 10/1/2026): Added

Common questions about N99.861

Is N99.861 billable?

Yes. N99.861 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N99.861 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N99.861 as a principal diagnosis.

Is N99.861 a CC or MCC?

No. N99.861 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N99.861 group to?

N99.861 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.

Did N99.861 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.