2026 ICD-10-CM Diagnosis Code M06.372Rheumatoid nodule, left ankle and foot
ICD-10-CM Codes›M00–M99›M05-M14›M06
- Billable — Valid for Submission
- Risk Adjusts — HCC 93
- Chronic Condition
M06.372 is a billable ICD-10-CM diagnosis code for rheumatoid nodule, left ankle and foot. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 545 through 547. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Rheumatoid arthritis and related disease.
For Medicare Advantage risk adjustment, M06.372 maps to CMS-HCC Category 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders) under the V28 model, adding a risk factor of about 0.617 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
M06.372 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bilateral nodule of subcutaneous tissue of feet
- Mass of subcutaneous tissue of bilateral feet
- Mass of subcutaneous tissue of bilateral lower limbs
- Mass of subcutaneous tissue of left foot
- Mass of subcutaneous tissue of right foot
- Nodule of subcutaneous tissue of bilateral lower limbs
- Nodule of subcutaneous tissue of foot
- Nodule of subcutaneous tissue of left foot
- Nodule of subcutaneous tissue of right foot
- Rheumatoid nodule of ankle
- Rheumatoid nodule of bilateral ankles
- Rheumatoid nodule of subcutaneous tissue of bilateral feet
- Rheumatoid nodule of subcutaneous tissue of foot
- Rheumatoid nodule of subcutaneous tissue of left ankle
- Rheumatoid nodule of subcutaneous tissue of left foot
- Rheumatoid nodule of subcutaneous tissue of right ankle
- Rheumatoid nodule of subcutaneous tissue of right foot
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Rheumatoid Arthritis
Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, and stiffness in your joints. RA is an autoimmune disease. Although it is most common in the wrist and fingers, this disease can cause your immune system to attack any joint tissue. The inflammation (swelling) that comes with RA can also affect other body parts.
The full article covers:
- What is rheumatoid arthritis?
- Who is more likely to get rheumatoid arthritis?
- What causes rheumatoid arthritis?
- What are the symptoms of rheumatoid arthritis?
- How is rheumatoid arthritis diagnosed?
- What are the treatments for rheumatoid arthritis?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M06.372 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M06.372Overview
What is the ICD-10 code for rheumatoid nodule, left ankle and foot?
The ICD-10-CM code for rheumatoid nodule, left ankle and foot is M06.372 (sometimes written as M06372). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is M06.372 (Rheumatoid nodule, ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rheumatoid nodule, left ankle and foot on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M06.372 group to?
When rheumatoid nodule, left ankle and foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 545, 546, 547, with relative weights from 0.8362 to 2.4817 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of M06.372?
Under the General Equivalence Mappings, rheumatoid nodule, left ankle and foot converts to ICD-9-CM 714.0 (rheumatoid arthritis). The mapping is approximate, so confirm the match fits the documentation.
What HCC is M06.372?
M06.372 (rheumatoid nodule, left ankle and foot) maps to CMS-HCC Category 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders), commonly written as HCC 93, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It mapped to HCC 40 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 83.
Does M06.372 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, M06.372 adds a risk adjustment factor of about 0.617 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.288 to 0.617 depending on the payment segment). HCC 93 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 93 category page.
