Granulomatosis with polyangiitis (GPA) confirmed in the absence of renal involvement — necrotizing granulomatous vasculitis affecting the respiratory tract and other systems, with kidneys explicitly spared or not yet implicated.
Verified May 8, 2026 · 5 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 0
- Region
- General
Documentation tips
What should appear in the chart to support M31.30.
Source · Editorial brief grounded in 5 cited references ↓
- The treating physician must explicitly state that renal involvement is absent — 'GPA without renal involvement' or 'no evidence of glomerulonephritis' — to justify M31.30 over M31.31 or an unspecified parent code.
- Record PR3-ANCA (c-ANCA) status in the note; positive PR3-ANCA supports the GPA diagnosis and strengthens medical necessity documentation for labs, imaging, and specialist referrals.
- Document biopsy findings when available — necrotizing granulomas on tissue pathology from respiratory tract or sinus tissue corroborate the diagnosis and satisfy clinical validation requirements.
- If urinalysis, BMP/CMP, or renal function tests were obtained to rule out renal involvement, note those results explicitly so auditors can confirm the 'without renal involvement' designation is supported.
- When GPA is a comorbidity at an orthopedic encounter (e.g., pre-op clearance), list M31.30 as a secondary diagnosis with documentation of how the condition affects management or risk.
Common coding pitfalls
The recurring mistakes coders make with M31.30 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Submitting the non-billable parent code M31.3 instead of M31.30 — M31.3 is not valid for claim submission; always code to the highest level of specificity.
- Defaulting to M31.30 when renal status is undocumented — if the record is silent on kidney involvement, the code is not supported; query the physician or hold the claim.
- Failing to update the code to M31.31 when a patient previously coded as M31.30 develops renal involvement — reassess at each encounter and recode when documentation changes.
- Confusing GPA with microscopic polyangiitis (M31.7) — both are ANCA-associated vasculitides, but they have distinct clinical and pathologic profiles; code assignment must follow the documented diagnosis, not assumed similarity.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
M31.30 is the billable code for Wegener's granulomatosis (granulomatosis with polyangiitis, GPA) when the diagnosis is established and renal involvement has been evaluated and ruled out or is not present. The hallmark clinical picture includes necrotizing granulomas of the upper and/or lower respiratory tract, small-to-medium vessel vasculitis, and PR3-ANCA positivity — without glomerulonephritis or other renal manifestations. Use M31.30 for encounters covering active management, rheumatology follow-up, or imaging review when documentation explicitly confirms no kidney involvement at that point in the disease course.
The critical branch point is M31.31 (with renal involvement). If the record documents glomerulonephritis, proteinuria, hematuria attributable to GPA, or a renal biopsy showing necrotizing changes, switch to M31.31. Do not default to M31.30 simply because renal labs weren't drawn — the physician must affirmatively document absence of renal involvement. The parent code M31.3 is non-billable; never submit it on a claim.
GPA sits within the systemic connective tissue disorders block (M30–M36) and is classified as a necrotizing vasculopathy. For orthopedic and musculoskeletal practices, this code surfaces most often when GPA is a comorbidity affecting surgical risk stratification, perioperative planning, or when joint/soft tissue manifestations of the disease are being evaluated alongside primary musculoskeletal complaints.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Includes
- Wegener's granulomatosis NOS
Sibling codes
Other billable codes under M31.3 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01What is the difference between M31.30 and M31.31?
02Can I use M31.3 on a claim instead of M31.30?
03Is M31.30 appropriate if renal labs simply weren't ordered at this visit?
04Does GPA lung involvement code to M31.30?
05How should M31.30 be sequenced at an orthopedic visit where GPA is a comorbidity?
06What ANCA finding supports the GPA diagnosis underlying M31.30?
07Is M31.30 a chronic condition indicator code?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 — https://www.cms.gov/medicare/coding/icd10
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M30-M36/M31-/M31.30
- 03icdcodes.aihttps://icdcodes.ai/diagnosis/granulomatosis/documentation
- 04icdlist.comhttps://icdlist.com/icd-10/M31.30
- 05aapc.comhttps://www.aapc.com/codes/icd-10-codes/M31.30
Mira AI Scribe
Mira AI Scribe captures the physician's documented confirmation that renal involvement is absent — including relevant lab values (creatinine, urinalysis, eGFR), ANCA serology results, and biopsy findings — to lock in M31.30 rather than leaving the encounter at the non-billable parent M31.3. Precise documentation prevents a denial or a query-driven rework cycle when the payer audits the renal-status distinction between M31.30 and M31.31.
See how Mira captures M31.30 documentation