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M86.8X59 ICD-10-CM Code: Other osteomyelitis, unspecified thigh

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

Coding at a Glance

Tabular directives
5 Excludes1 · 4 Excludes2 · 2 use-additional codes

Code Set: New for FY2027 — not valid before October 1, 2026.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M86.8X59 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on M86.8X59 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).

Excludes2 — Not Included Here

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

Source: inherited from M86

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code (B95-B97) to identify infectious agent
  • Use additional code to identify major osseous defect, if applicable (M89.7-)

Source: inherited from M86

7th Character Guide

  • 1 — right thigh
  • 2 — left thigh
  • 9 — unspecified thigh (this page’s code)

Variant codes in this family

M86.8X51, M86.8X52, M86.8X59

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Code Overview

Other osteomyelitis, unspecified thigh is a billable ICD-10-CM diagnosis code (M86.8X59).

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

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
  2. 2 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  3. 5 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  4. 4 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

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

Other codes that name M86.8X59 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 1 Code First instruction: M89.7 — Major osseous defect (via M86.-).

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.

Related Codes

Same condition, opposite side

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

M86.8X51 — Other osteomyelitis, right thigh (right)Compare M86.8X59 vs M86.8X51 →, M86.8X52 — Other osteomyelitis, left thigh (left)Compare M86.8X59 vs M86.8X52 →

Same Index main term, other category

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

M71.01 — Abscess of bursa, shoulder (bursa, shoulder), M71.02 — Abscess of bursa, elbow (bursa, elbow), M71.03 — Abscess of bursa, wrist (bursa, wrist), M71.04 — Abscess of bursa, hand (bursa, hand), M71.05 — Abscess of bursa, hip (bursa, hip), M71.06 — Abscess of bursa, knee (bursa, knee), M71.07 — Abscess of bursa, ankle and foot (bursa, foot), M71.08 — Abscess of bursa, other site (bursa, specified site NEC), M71.09 — Abscess of bursa, multiple sites (bursa, multiple sites), M72.8 — Other fibroblastic disorders (fascia), N13.6 — Pyonephrosis (kidney, with calculus, with hydronephrosis), N15.1 — Renal and perinephric abscess (kidney), N20.0 — Calculus of kidney (kidney, with calculus), N28.89 — Other specified disorders of kidney and ureter (periureteral), N34.0 — Urethral abscess (lacunar), N41.2 — Abscess of prostate (prostate), N45.4 — Abscess of epididymis or testis (testis), N48.21 — Abscess of corpus cavernosum and penis (penis), N49.0 — Inflammatory disorders of seminal vesicle (seminal vesicle), N49.1 — Inflammatory disorders of spermatic cord, tunica vaginalis and vas deferens (vas deferens), +173 more

Contextual Map

Every relationship of M86.8X59 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 M86.8X59 with this related code in Claim Check

Hierarchy

Referenced by Code First instructions

Nearest codes (40)

Change history

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
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

Change history

  • Upcoming · effective FY2027 — October 1, 2026
    Will be added to the code set
    Other osteomyelitis, unspecified thigh
    FY2027 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M86.8X59 in its code family, with their registry titles.

View all codes in the M86 family