ICDcodes.org
FY2027

N05.A — Unspecified nephritic syndrome with C3 glomerulonephritis

BillableUnspecifiedCC

Is N05.A billable?

Yes, but N05.A is an unspecified code. N05.A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, N05.A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting N05.A — the more specific alternatives are listed below.

More specific alternatives

N05.A at a glance

CodeN05.A
DescriptionUnspecified nephritic syndrome with C3 glomerulonephritis
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does N05.A group to?

N05.A sits in MDC 11 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 698Other Kidney and Urinary Tract Diagnoses with MCCmedical
  • 699Other Kidney and Urinary Tract Diagnoses with CCmedical
  • 700Other Kidney and Urinary Tract Diagnoses without CC/MCCmedical

As a secondary diagnosis, N05.A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is N05.A listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to N05.A. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Glomerulonephritis › with › C3 › glomerulonephritis
  • Glomerulonephritis › with › C3 › glomerulopathy
  • Nephritis, nephritic › with › C3 › glomerulonephritis (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
  • Nephritis, nephritic › with › C3 › glomerulopathy (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)

Excludes1 — never code together

The conditions below can never be reported together with N05.A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • Unspecified nephritic syndrome (with C3 glomerulopathy) with dense deposit disease (N05.6)

Inclusion terms

Alternative wording in documentation that is classified to N05.A.

  • Unspecified nephritic syndrome with C3 glomerulopathy

Excludes1 — never code together — inherited from N00-N08

The conditions below can never be reported together with N05.A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • hypertensive chronic kidney disease (I12.-)

Excludes1 — never code together — inherited from N05

The conditions below can never be reported together with N05.A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • nephropathy NOS with no stated morphological lesion (N28.9)
  • renal disease NOS with no stated morphological lesion (N28.9)
  • tubulo-interstitial nephritis NOS (N12)

Excludes2 — not included here — inherited from Chapter 14

The conditions below are not part of N05.A, but a patient may have both at the same time. When documentation supports it, N05.A and the excluded code may both 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)

Code also — inherited from N00-N08

Two codes may be needed to describe the condition fully. Whether N05.A is sequenced first depends on the reason for the encounter.

  • any associated kidney failure (N17-N19).

How long has N05.A existed?

N05.A first appears in FY2021 (FY2020 is not available, so it may have appeared then).

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with N05.A?

ICD-10-CM declares these codes mutually exclusive with N05.A — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to N05.A?

What other codes are in the N05 family? (10)