M05.29

Rheumatoid vasculitis with seropositive rheumatoid arthritis affecting multiple joint sites simultaneously, representing a severe systemic complication where vascular inflammation is present alongside polyarticular disease.

Verified May 8, 2026 · 7 sources ↓

Status: Billable
Chapter: 13
Related CPT: 8
Region: Multi-region

Drawn from CDCICD10DataAAPCCMSNIH

Documentation tips

What should appear in the chart to support M05.29.

Source · Editorial brief grounded in 7 cited references ↓

Name every affected joint site in the clinical note — 'multiple sites' must be supported by explicit enumeration, not inferred.
Document seropositivity (positive RF or anti-CCP lab result) to justify placement in M05 rather than M06 (seronegative RA).
Record the vasculitic findings separately (e.g., skin ulcers, mononeuritis multiplex, digital ischemia) — vasculitis must be clinically established, not assumed from RA diagnosis alone.
Include disease activity measure (e.g., DAS28 score) and current DMARD or biologic regimen to support medical necessity for advanced therapies.
If imaging was performed, reference the specific joints imaged and findings (erosions, synovitis, joint space narrowing) that corroborate multi-site involvement.

Related CPT procedures

Procedure codes commonly billed with M05.29. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

20610 $68.81

Aspiration and/or injection of a major joint or bursa (shoulder, hip, knee, or subacromial bursa) performed without ultrasound guidance.

20600 $56.11

Needle aspiration and/or injection of a small joint or bursa — such as a finger or toe joint — performed without ultrasound guidance.

97110 $29.06

Therapeutic exercise billed per 15-minute unit, targeting strength, endurance, range of motion, or flexibility with direct one-on-one patient contact.

99213 $95.19

Established patient office or outpatient visit requiring 20–29 minutes of total time or low-complexity medical decision-making.

99214 $135.61

Office visit for an established patient requiring moderate-complexity medical decision making (MDM), or 30–39 minutes of total provider time on the date of service.

96413 View procedure details

96365 View procedure details

97530 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M05.29 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

Using M05.29 when only one joint is affected — select the site-specific laterality code (e.g., M05.261 for right knee) instead.
Defaulting to M05.29 as a catch-all when laterality is undocumented — query the provider; 'unspecified' codes exist at each site level for that scenario.
Billing M05.2 (parent code) instead of M05.29 — M05.2 is non-billable and will reject; always use the billable child code.
Omitting documentation of the vasculitic component and relying on RA alone — payers may downcode or deny if vasculitis is not independently supported in the record.
Confusing M05.29 (seropositive, multiple sites) with M06.09 (seronegative RA, multiple sites) — serostatus must be documented and drive code selection.

Clinical context

Source · Editorial summary grounded in 7 cited references ↓

M05.29 codes rheumatoid vasculitis with rheumatoid arthritis of multiple sites. Use it when the patient has seropositive RA (positive RF or anti-CCP) with documented vasculitic involvement and the disease affects more than one joint region — for example, bilateral hands plus knees, or shoulder plus ankle plus wrist in the same encounter. This is a step up in specificity from M05.20 (unspecified site) and bypasses the need for separate site-specific codes when polyarticular involvement is clinically established.

M05.2 (the parent) is non-billable; M05.29 is the billable 'multiple sites' terminus within that subcategory. The other billable children of M05.2 are site-specific codes with laterality (e.g., M05.261 right knee, M05.262 left knee). Use M05.29 only when the multi-site pattern is documented — not as a shortcut when laterality is simply unclear. If the rheumatologist documents a single joint with vasculitis, select the site-specific code.

Rheumatoid vasculitis is an extra-articular manifestation of RA that signals high disease severity. Payers — including Medicare — treat M05 codes as reasonable proxies for seropositive RA. Expect prior authorization scrutiny on biologic DMARDs and infusion services billed alongside this code; clinical notes must support both the vasculitic component and the multi-site joint involvement.

Sibling codes

Other billable codes under M05.2 (laterality / anatomic variants).

M05.20

Rheumatoid vasculitis with rheumatoid arthritis of unsp site

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01What is the difference between M05.29 and M05.20?

M05.20 is for rheumatoid vasculitis with RA of an unspecified site — use it only when site documentation is absent. M05.29 specifies that multiple sites are involved and requires documentation naming those sites.

02Is M05.29 billable for FY2026?

Yes. M05.29 became effective October 1, 2025 under the FY2026 ICD-10-CM code set and is a valid billable/specific code per the CDC Tabular List.

03Can M05.29 be used without confirmed lab seropositivity?

M05 codes are the standard proxy for seropositive RA. If RF and anti-CCP results are unavailable, M05 can still be used when the clinician documents seropositive RA, but the note should reflect that clinical determination — not just an unconfirmed assumption.

04Should I use M05.29 or multiple site-specific M05.2x codes?

Use M05.29 when the provider documents polyarticular vasculitic RA across multiple distinct sites in a single encounter. If only bilateral involvement of the same joint is noted (e.g., both knees), consider whether site-specific bilateral codes better capture the encounter. M05.29 is appropriate for true multi-region, multi-joint disease.

05Does rheumatoid vasculitis with RA qualify patients for Medicare routine foot care exceptions?

Yes. CMS Billing and Coding Article A57954 (Routine Foot Care) lists certain systemic conditions affecting the lower extremities, and RA with vascular involvement can support medical necessity for otherwise-routine foot care services. Confirm with the applicable MAC LCD for your jurisdiction.

06What CPT codes are commonly billed alongside M05.29?

Biologic infusion codes (96413, 96365) are common when DMARDs are administered in-office. Joint injection codes (20610, 20600) apply when large or small joints are injected. Physical therapy evaluation and therapeutic procedure codes (97110, 97530) appear in rehabilitation-focused encounters.

07How does M05.29 interact with HCC risk adjustment?

M05 codes map to HCC models as seropositive RA. Consistent use of M05.29 across encounters supports accurate RAF scoring. Per PMC research, M05 codes show high sensitivity (0.76–0.76) and positive predictive value (0.82–0.84) as proxies for seropositive RA when lab data is unavailable.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira captures joint-by-joint involvement (with side), lab seropositivity (RF or anti-CCP), and specific vasculitic findings from the encounter note to lock in M05.29 over a vague multi-site RA code. That prevents a non-billable M05.2 submission, a serostatus mismatch with M06, and a missing-vasculitis audit flag that could trigger denial on biologic infusion claims.

See how Mira captures M05.29 documentation