New for FY2027 ICD-10-CM · October 1, 2026
N99.86: Intraoperative and postprocedural complications and disorders of breast
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Intraoperative and postprocedural complications and disorders of breast. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: N00-N99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: N00-N99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: N00-N99 (chapter, inherited).
Excludes2
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Source: N00-N99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: N00-N99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: N00-N99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: N00-N99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: N00-N99 (chapter, inherited).
Excludes2
irradiation cystitis (N30.4-)
Source: N99 (category, inherited).
Excludes2
postoophorectomy osteoporosis with current pathological fracture (M80.8-)
Source: N99 (category, inherited).
Excludes2
postoophorectomy osteoporosis without current pathological fracture (M81.8)
Source: N99 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does N99.86 mean in FY2027?
The official ICD-10-CM descriptor is Intraoperative and postprocedural complications and disorders of breast. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
When did N99.86 become an ICD-10-CM code?
N99.86 is new for FY2027 ICD-10-CM, effective October 1, 2026. It is absent from the FY2026 April order file. Use the code set that applies to the encounter or inpatient discharge date, and check the official Tabular instructions.
Is N99.86 billable in FY2027?
The FY2027 order file marks N99.86 as a nonbillable heading. Select a complete billable child code.
Does N99.86 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.