M05.30

Rheumatoid heart disease — encompassing rheumatoid carditis, endocarditis, myocarditis, and pericarditis — occurring in a patient with seropositive rheumatoid arthritis, where the joint site affected is not specified in the documentation.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 5
Region: General

Drawn from CDCICD10DataCMSRhinomdsRheumatologyadvisor

Documentation tips

What should appear in the chart to support M05.30.

Source · Editorial brief grounded in 5 cited references ↓

Record the specific cardiac manifestation explicitly — rheumatoid carditis, endocarditis, myocarditis, or pericarditis — since all are inclusion terms under M05.3 and each supports the cardiac involvement claim.
Document positive rheumatoid factor lab results (anti-CCP, RF titer) to confirm the seropositive RA basis required for any M05 code.
If a specific joint is involved, name it in the note — shoulder, knee, wrist, etc. — so you can use a site-specific subcode (M05.311–M05.39) instead of the unspecified M05.30.
Note that M05.30 is appropriate only when joint site is genuinely unspecified; using it when a joint is documented constitutes underspecification and may trigger an audit flag.
When submitting with CPT 81490 under the CMS Biomarkers LCD, ensure the medical record explicitly connects the RA diagnosis to the biomarker test indication per Article A56541 documentation requirements.

Related CPT procedures

Procedure codes commonly billed with M05.30. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

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.

81490 View procedure details

93306 View procedure details

93000 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M05.30 and adjacent codes.

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

Confusing M05.3x (rheumatoid heart disease as an RA systemic manifestation) with I01.x–I09.x rheumatic heart disease codes — these are Type 1 Excludes at the category level and must never be coded together.
Defaulting to M05.30 when a joint site is actually documented: if the note names a specific joint, the site-specific 6-character subcode (e.g., M05.361 for right knee) is required.
Assigning M05.30 for juvenile RA patients — M08.- is the correct category; M05 codes are Type 1 Excluded for juvenile rheumatoid arthritis.
Using the non-billable parent M05.3 on a claim instead of drilling down to the billable M05.30 (unspecified site) or a site-specific child code.
Failing to link the cardiac manifestation explicitly to seropositive RA in documentation — without this connection, payers may reclassify the cardiac code to a standalone cardiovascular diagnosis.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

M05.30 is the billable code for rheumatoid heart disease with rheumatoid arthritis when the provider documents cardiac involvement (carditis, endocarditis, myocarditis, or pericarditis) as a manifestation of seropositive RA but does not specify which joint site is involved. It sits under parent code M05.3, which is non-billable. Use M05.30 only when joint site documentation is genuinely absent — if a specific joint is documented, step down to the site-specific subcodes (M05.31x–M05.39).

This code belongs to the M05 category: Rheumatoid arthritis with rheumatoid factor. Three Type 1 Excludes apply at the category level: never assign M05.30 alongside rheumatic fever codes (I00), juvenile rheumatoid arthritis codes (M08.-), or rheumatoid arthritis of the spine (M45.-). Critically, do not confuse M05.3x cardiac manifestations with rheumatic heart disease codes (I01.0–I09.9) — these are distinct conditions with separate etiologies and must not be used interchangeably.

M05.30 appears on the CMS Biomarkers LCD (Article A56541) as a Group 2 ICD-10-CM code supporting medical necessity for CPT 81490 (autoimmune rheumatoid arthritis biomarker testing), which is limited to two services per rolling year per beneficiary. Document positive rheumatoid factor, cardiac manifestation type, and any available joint involvement to support this code and satisfy LCD requirements.

Sibling codes

Other billable codes under M05.3 (laterality / anatomic variants).

M05.39

Rheumatoid heart disease w rheumatoid arthritis mult site

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01When should I use M05.30 instead of a site-specific M05.3x code?

Use M05.30 only when the provider's documentation does not identify a specific joint site. If any joint is named — shoulder, knee, wrist, etc. — use the corresponding site-specific subcode (e.g., M05.361 for right knee). M05.30 is the true 'unspecified site' fallback, not a default.

02Can I code M05.30 alongside a rheumatic heart disease code like I05 or I08?

No. M05 carries a Type 1 Excludes for rheumatic fever (I00) and related codes. Rheumatoid heart disease (M05.3x) and rheumatic heart disease (I01–I09) are distinct diagnoses with different etiologies and must not appear together on the same claim.

03Does M05.30 support the CMS biomarker CPT code 81490?

Yes. CMS Article A56541 lists M05.30 in Group 2 as an ICD-10-CM code supporting medical necessity for CPT 81490 (autoimmune rheumatoid arthritis biomarker test). Note that 81490 is limited to two services per rolling year per beneficiary under that LCD.

04Is M05.30 valid for a patient with juvenile rheumatoid arthritis?

No. M05 has a Type 1 Excludes for juvenile rheumatoid arthritis (M08.-). For pediatric RA patients, use the M08 category. M05.30 applies only to adult seropositive RA with cardiac involvement.

05What cardiac manifestations are included under M05.30?

The ICD-10-CM tabular inclusion terms for M05.3 are rheumatoid carditis, rheumatoid endocarditis, rheumatoid myocarditis, and rheumatoid pericarditis. All four are covered under M05.30 when joint site is unspecified.

06Does rheumatoid arthritis of the spine with heart involvement use M05.30?

No. Rheumatoid arthritis of the spine is coded to M45.- per the Type 1 Excludes on M05. If a patient has axial RA with cardiac manifestations, query the provider; M05.30 is not the correct code for spinal involvement.

07Is M05.30 an HCC-relevant code?

M05 codes for seropositive RA with systemic involvement, including cardiac manifestations, are relevant under CMS HCC risk-adjustment models. Accurate specificity — especially documenting cardiac manifestation type and seropositive status — supports appropriate HCC capture and prevents down-mapping.

Sources & references

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

Mira AI Scribe

Mira AI Scribe captures the cardiac manifestation type (carditis, endocarditis, myocarditis, or pericarditis), positive rheumatoid factor results, and any joint sites mentioned during the encounter. Capturing the joint site prevents default to M05.30 when a more specific subcode applies — avoiding underspecification that can trigger an audit or downcode under HCC risk-adjustment models.

See how Mira captures M05.30 documentation