2026 ICD-10-CM Diagnosis Code M06.279Rheumatoid bursitis, unspecified ankle and foot
ICD-10-CM Codes›M00–M99›M05-M14›M06
- Billable — Valid for Submission
- Risk Adjusts — HCC 93
- Chronic Condition
M06.279 is a billable ICD-10-CM diagnosis code for rheumatoid bursitis, unspecified 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, M06.279 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
M06.279 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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bursitis
A bursa is a small, fluid-filled sac that acts as a cushion between a bone and other moving parts, such as muscles, tendons, or skin. Bursitis occurs when a bursa becomes inflamed. People get bursitis by overusing a joint. It can also be caused by an injury. It usually occurs at the knee or elbow.
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Convert M06.279 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M06.279Overview
What is the ICD-10 code for rheumatoid bursitis, unspecified ankle and foot?
The ICD-10-CM code for rheumatoid bursitis, unspecified ankle and foot is M06.279 (sometimes written as M06279). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is M06.279 (Rheumatoid bursitis, ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rheumatoid bursitis, unspecified ankle and foot on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M06.279 group to?
When rheumatoid bursitis, unspecified 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 M06.279?
Under the General Equivalence Mappings, rheumatoid bursitis, unspecified 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 M06.279?
M06.279 (rheumatoid bursitis, unspecified 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 M06.279 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, M06.279 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.
