2027 ICD-10-CM Diagnosis Code N99.861Intraoperative and postprocedural nipple necrosis
N99.861 is a billable ICD-10-CM diagnosis code for intraoperative and postprocedural nipple necrosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 600 through 601.
Code Identity
Code Classification
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N99.861: its own notes plus those printed at N99 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name N99.861, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming N99.861: its condition is not part of those codes, and both may be reported when the patient has both.
- Block T80-T88 Complications of surgical and medical care, not elsewhere classifiedintraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-) names N99.-, which includes this code
- T81 Complications of procedures, not elsewhere classifiedintraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-) names N99.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Necrosis, necrotic (ischemic) See Also: Gangrene;
Code History & ChangesHistory
New Code N99.861 was added to the ICD-10-CM code set for FY 2027, effective October 1, 2026.
Replacement N99.861 replaces the following previously assigned code(s):
- N99.89 - Oth postprocedural complications and disorders of GU sys
Questions About N99.861Overview
What is the ICD-10 code for intraoperative and postprocedural nipple necrosis?
The ICD-10-CM code for intraoperative and postprocedural nipple necrosis is N99.861 (sometimes written as N99861). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N99.861 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report intraoperative and postprocedural nipple necrosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N99.861 group to?
When intraoperative and postprocedural nipple necrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 600, 601, with relative weights from 0.6014 to 0.9971 depending on complications. Higher weights mean higher Medicare reimbursement.
