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M19.19 ICD-10-CM Code: Post-traumatic osteoarthritis, other specified site

Compare with another code for M19.19Check this code on a claim

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

Coding at a Glance

Tabular directives
1 Excludes1 · 3 Excludes2

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Excludes1from M19Not reported with this code unless documented as unrelated
  • polyarthritis (M15.-)
Excludes2Not included here; may be reported together
  • arthrosis of spine (M47.-) (from M19)
  • hallux rigidus (M20.2) (from M19)
  • osteoarthritis of spine (M47.-) (from M15-M19)

Where it sits Source: CMS/NCHS

Under:Chapter 13: Diseases of the Musculoskeletal System and Connective TissueM00-M25 ArthropathiesM15-M19 OsteoarthritisM19 Other and unspecified osteoarthritisM19.1 Post-traumatic osteoarthritis of other joints

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

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 v44, Appendix B.

  • MS-DRG 553 — BONE DISEASES AND ARTHROPATHIES WITH MCC (MDC 08)
  • MS-DRG 554 — BONE DISEASES AND ARTHROPATHIES WITHOUT 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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M19.19 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on M19.19 itself; “inherited from” names the category or block whose note applies here.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from M19

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Coder workflow for M19.19

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

Before you code M19.19

  1. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on M19.19; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewM19.11, M19.12, M19.13, M19.14, M19.17

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with M19.19. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in M19.19’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewM15

Consider M19.19. 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).
Any detail beyond this code’s title
What the record states that a more specific code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting M19.19(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with M19.19: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareM15

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of M19.19(3 notes)

    Coding workflow: The conditions named in this note are not included in M19.19. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareM47, M20.2

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

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

Documentation: Both the condition M19.19 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewM15

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.

Don’t confuse M19.19 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of M19.19 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • M15— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of polyarthritis moves the case to M15; the two are not reported together unless documented as unrelated.

    Full comparison: M19.19 vs M15 →

  • M47— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of arthrosis of spine adds M47; it is not part of this code and both may be reported when both are documented.

    Full comparison: M19.19 vs M47 →

  • M20.2— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of hallux rigidus adds M20.2; it is not part of this code and both may be reported when both are documented.

    Full comparison: M19.19 vs M20.2 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Post-traumatic osteoarthritis, other specified site is a billable ICD-10-CM diagnosis code (M19.19).

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-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name M19.19 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 4 Excludes1 notes: M12 — Other and unspecified arthropathy (via M19.-), M12.5 — Traumatic arthropathy (via M19.1.-), M13 — Other arthritis (via M19.-), M15 — Polyosteoarthritis (via M19.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 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 2 MS-DRGs: DRG 553 (MDC 08), DRG 554 (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):MUS006 — Osteoarthritis (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 clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Osteoarthritis).

M19.129 — Post-traumatic osteoarthritis, unspecified elbow, M19.131 — Post-traumatic osteoarthritis, right wrist, M19.132 — Post-traumatic osteoarthritis, left wrist, M19.139 — Post-traumatic osteoarthritis, unspecified wrist, M19.141 — Post-traumatic osteoarthritis, right hand, M19.142 — Post-traumatic osteoarthritis, left hand, M19.149 — Post-traumatic osteoarthritis, unspecified hand, M19.171 — Post-traumatic osteoarthritis, right ankle and foot, M19.172 — Post-traumatic osteoarthritis, left ankle and foot, M19.179 — Post-traumatic osteoarthritis, unspecified ankle and foot, M19.211 — Secondary osteoarthritis, right shoulder, M19.212 — Secondary osteoarthritis, left shoulder, M19.219 — Secondary osteoarthritis, unspecified shoulder, M19.221 — Secondary osteoarthritis, right elbow, M19.222 — Secondary osteoarthritis, left elbow, M19.229 — Secondary osteoarthritis, unspecified elbow, M19.231 — Secondary osteoarthritis, right wrist, M19.232 — Secondary osteoarthritis, left wrist, M19.239 — Secondary osteoarthritis, unspecified wrist, M19.241 — Secondary osteoarthritis, right hand, +77 more

Same Index main term, other category

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

M16.3 — Unilateral osteoarthritis resulting from hip dysplasia (hip, due to hip dysplasia), M16.4 — Bilateral post-traumatic osteoarthritis of hip (hip, bilateral, post-traumatic), M16.5 — Unilateral post-traumatic osteoarthritis of hip (post-traumatic NEC, hip), M16.6 — Other bilateral secondary osteoarthritis of hip (secondary, hip, bilateral), M16.7 — Other unilateral secondary osteoarthritis of hip (secondary, hip), M16.9 — Osteoarthritis of hip, unspecified (hip), M17.0 — Bilateral primary osteoarthritis of knee (knee, bilateral), M17.1 — Unilateral primary osteoarthritis of knee (knee, primary), M17.2 — Bilateral post-traumatic osteoarthritis of knee (knee, bilateral, post-traumatic), M17.3 — Unilateral post-traumatic osteoarthritis of knee (post-traumatic NEC, knee), M17.4 — Other bilateral secondary osteoarthritis of knee (secondary, knee, bilateral), M17.5 — Other unilateral secondary osteoarthritis of knee (secondary, knee), M17.9 — Osteoarthritis of knee, unspecified (knee), M18.0 — Bilateral primary osteoarthritis of first carpometacarpal joints (primary, hand joint, first carpometacarpal joint, bilateral), M18.1 — Unilateral primary osteoarthritis of first carpometacarpal joint (primary, hand joint, first carpometacarpal joint), M18.2 — Bilateral post-traumatic osteoarthritis of first carpometacarpal joints (post-traumatic NEC, hand joint, first carpometacarpal joint, bilateral), M18.3 — Unilateral post-traumatic osteoarthritis of first carpometacarpal joint (post-traumatic NEC, hand joint, first carpometacarpal joint), M18.4 — Other bilateral secondary osteoarthritis of first carpometacarpal joints (secondary, hand joint, first carpometacarpal joint, bilateral), M18.5 — Other unilateral secondary osteoarthritis of first carpometacarpal joint (secondary, hand joint, first carpometacarpal joint), M18.9 — Osteoarthritis of first carpometacarpal joint, unspecified (hand joint, first carpometacarpal joint), +10 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of M19.19 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 M19.19 with these 4 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • M12 — Other and unspecified arthropathy[Excludes1](via M19.-): “arthrosis (M15-M19)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • M12.5 — Traumatic arthropathy[Excludes1](via M19.1.-): “post-traumatic osteoarthritis NOS (M19.1-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • M13 — Other arthritis[Excludes1](via M19.-): “arthrosis (M15-M19)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • M15 — Polyosteoarthritis[Excludes1](via M19.-): “bilateral involvement of single joint (M16-M19)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Clinical classification (CCSR)

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. 18,439 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Osteoarthritis, post-traumatic NEC, specified site NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (40)

Change history

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 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 — v44 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

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. "M19.19 — Post-traumatic osteoarthritis, other specified site." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/m19.19-post-traumatic-osteoarthritis-other-specified-site

Change history

  • FY2021 — October 1, 2020
    Added to the code set
    Post-traumatic osteoarthritis, other specified site
    FY2021 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M19.19 in its code family, with their registry titles.

View all codes in the M19 family