FY2027 ICD-10-CM reference
N05.9: Unspecified nephritic syndrome with unspecified morphologic changes
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Unspecified nephritic syndrome with unspecified morphologic changes. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
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).
Code also
any associated kidney failure (N17-N19).
Source: N00-N08 (section, inherited).
Excludes1
hypertensive chronic kidney disease (I12.-)
Source: N00-N08 (section, inherited).
Includes
glomerular disease NOS
Source: N05 (category, inherited).
Includes
glomerulonephritis NOS
Source: N05 (category, inherited).
Includes
nephritis NOS
Source: N05 (category, inherited).
Includes
nephropathy NOS and renal disease NOS with morphological lesion specified in .0-.8
Source: N05 (category, inherited).
Excludes1
nephropathy NOS with no stated morphological lesion (N28.9)
Source: N05 (category, inherited).
Excludes1
renal disease NOS with no stated morphological lesion (N28.9)
Source: N05 (category, inherited).
Excludes1
tubulo-interstitial nephritis NOS (N12)
Source: N05 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does N05.9 mean in FY2027?
The official ICD-10-CM descriptor is Unspecified nephritic syndrome with unspecified morphologic changes. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is N05.9 billable in FY2027?
The FY2027 order file marks N05.9 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does N05.9 map to an HCC?
N05.9 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition