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M06.321 ICD-10-CM Code: Rheumatoid nodule, right elbow

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 40 · RxHCC V08 category 83

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 545 — CONNECTIVE TISSUE DISORDERS WITH MCC (MDC 08)
  • MS-DRG 546 — CONNECTIVE TISSUE DISORDERS WITH CC (MDC 08)
  • MS-DRG 547 — CONNECTIVE TISSUE DISORDERS WITHOUT CC/MCC (MDC 08)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders (supersedes HCC 94)

Other models: CMS-HCC V22 HCC 40 · RxHCC V08 HCC 83

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coder workflow for M06.321

MedCoder structured workflow — derived from this code’s own official record

Before you code M06.321

  1. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: right). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    ReviewM06.322 · left, M06.329 · unspecified

    Guide: Laterality coding →

Choose the right path

  1. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

    ReviewM06.322 · left, M06.329 · unspecified

Consider M06.321. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

ReviewM06.322 · left, M06.329 · unspecified

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Rheumatoid nodule, right elbow is a billable ICD-10-CM diagnosis code (M06.321).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name M06.321 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Code First instructions: J84.170 — Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere (via M06.-), J84.178 — Other interstitial pulmonary diseases with fibrosis in diseases classified elsewhere (via M06.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 3 MS-DRGs: DRG 545 (MDC 08), DRG 546 (MDC 08), DRG 547 (MDC 08).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MUS003 — Rheumatoid arthritis and related disease (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

M06.322 — Rheumatoid nodule, left elbow (left)Compare M06.321 vs M06.322 →, M06.329 — Rheumatoid nodule, unspecified elbow (unspecified)Compare M06.321 vs M06.329 →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders) for risk-adjusted payment.

M06.269 — Rheumatoid bursitis, unspecified knee, M06.271 — Rheumatoid bursitis, right ankle and foot, M06.272 — Rheumatoid bursitis, left ankle and foot, M06.279 — Rheumatoid bursitis, unspecified ankle and foot, M06.28 — Rheumatoid bursitis, vertebrae, M06.29 — Rheumatoid bursitis, multiple sites, M06.30 — Rheumatoid nodule, unspecified site, M06.311 — Rheumatoid nodule, right shoulder, M06.312 — Rheumatoid nodule, left shoulder, M06.319 — Rheumatoid nodule, unspecified shoulder, M06.322 — Rheumatoid nodule, left elbow, M06.329 — Rheumatoid nodule, unspecified elbow, M06.331 — Rheumatoid nodule, right wrist, M06.332 — Rheumatoid nodule, left wrist, M06.339 — Rheumatoid nodule, unspecified wrist, M06.341 — Rheumatoid nodule, right hand, M06.342 — Rheumatoid nodule, left hand, M06.349 — Rheumatoid nodule, unspecified hand, M06.351 — Rheumatoid nodule, right hip, M06.352 — Rheumatoid nodule, left hip, +487 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Rheumatoid arthritis and related disease).

+340 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Nodule, nodular”; these codes share that main term but sit in a different category of the Tabular List.

A52.77 — Syphilis of bone and joint (juxta-articular, syphilitic), A66.7 — Other manifestations of yaws (juxta-articular, yaws), B08.03 — Pseudocowpox [milker's node] (milker's), D26.1 — Other benign neoplasm of corpus uteri (endometrial), E04.1 — Nontoxic single thyroid nodule (thyroid), E05.20 — Thyrotoxicosis with toxic multinodular goiter without thyrotoxic crisis or storm (thyroid, with thyrotoxicosis), E05.21 — Thyrotoxicosis with toxic multinodular goiter with thyrotoxic crisis or storm (thyroid, with thyrotoxicosis, with thyroid storm), J38.2 — Nodules of vocal cords (singer's), J38.7 — Other diseases of larynx (larynx), M15.8 — Other polyosteoarthritis (Haygarth's), N40.2 — Nodular prostate without lower urinary tract symptoms (prostate), N40.3 — Nodular prostate with lower urinary tract symptoms (prostate, with lower urinary tract symptoms), N49.2 — Inflammatory disorders of scrotum (scrotum), N63.0 — Unspecified lump in unspecified breast (breast NEC), R09.89 — Other specified symptoms and signs involving the circulatory and respiratory systems (retrocardiac), R91.1 — Solitary pulmonary nodule (solitary, lung), R91.8 — Other nonspecific abnormal finding of lung field (solitary, lung, multiple)

Contextual Map

Every relationship of M06.321 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run M06.321 with these 2 related codes in Claim Check

Hierarchy

Referenced by Code First instructions

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders [CMS-HCC]: “Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders — supersedes HCC 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders)”— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue[MDC crossing]: “Diseases and Disorders of the Musculoskeletal System and Connective Tissue — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 18,508 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "M06.321 — Rheumatoid nodule, right elbow." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/m06.321-rheumatoid-nodule-right-elbow

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Rheumatoid nodule, right elbow

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M06.321 in its code family, with their registry titles.

View all codes in the M06 family