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M86.8X89 ICD-10-CM Code: Other osteomyelitis, other site

Compare with another codeCheck 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
5 Excludes1 · 4 Excludes2 · 2 use-additional codes

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; the Instructions section marks which is which.

Use additional codeReport with this code when documented
  • code (B95-B97) to identify infectious agent
  • code to identify major osseous defect, if applicable (M89.7-)
Excludes1Never report with this code

+1 more in Instructions

Excludes2Not included here; may be reported together

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 456 — SPINAL FUSION EXCEPT CERVICAL WITH SPINAL CURVATURE, MALIGNANCY, OR INFECTION WITH MCC (MDC 08)
  • MS-DRG 457 — SPINAL FUSION EXCEPT CERVICAL WITH SPINAL CURVATURE, MALIGNANCY, OR INFECTION WITH CC (MDC 08)
  • MS-DRG 458 — SPINAL FUSION EXCEPT CERVICAL WITH SPINAL CURVATURE, MALIGNANCY, OR INFECTION WITHOUT CC/MCC (MDC 08)
  • MS-DRG 539 — OSTEOMYELITIS WITH MCC (MDC 08)
  • MS-DRG 540 — OSTEOMYELITIS WITH CC (MDC 08)
  • MS-DRG 541 — OSTEOMYELITIS 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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M86.8X89 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 M86.8X89 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

  • 0 — skull
  • 1 — face and sinuses
  • 9 — other site (this page’s code)

Variant codes in this family

M86.8X80, M86.8X81, M86.8X89

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.

Coder workflow for M86.8X89

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

Before you code M86.8X89

  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 M86.8X89; 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).

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

  2. A 7th character is required in this family. Confirm the documentation supports the character assigned — its meaning in this family is defined in the official instruction. This page’s code carries “9”. The official 7th-character definitions for this family are quoted in the guide.

    See the 7th Character Guide

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with M86.8X89. 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 M86.8X89’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.

    ReviewB67.2, A54.43, A02.24, M96

  2. Does the documentation support one of this family’s 7th-character values?
    Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
    No → The code is invalid without its 7th character — query for the missing element.

Consider M86.8X89. Then work the Use Additional Code note, and 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).
7th-character basis
The documented element this family’s 7th character records (see the official definitions in the 7th Character Guide).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting M86.8X89(5 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with M86.8X89: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareB67.2, A54.43, A02.24, M96

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

  • Excludes2 — not part of M86.8X89(4 notes)

    Coding workflow: The conditions named in this note are not included in M86.8X89. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareH05.0, H70.2, M46.2

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

  • Use Additional Code — after identifying M86.8X89(2 notes)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with M86.8X89 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewM89.7

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

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

Documentation: Both the condition M86.8X89 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).

ReviewB67.2, A54.43, A02.24, M96

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with M86.8X89?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

ReviewM89.7

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 M86.8X89 with…

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

The codes most likely to be picked instead of M86.8X89 — 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.

  • B67.2— 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 echinococcus moves the case to B67.2; the two are not reported together unless documented as unrelated.

    Full comparison: M86.8X89 vs B67.2 →

  • A54.43— 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 gonococcus moves the case to A54.43; the two are not reported together unless documented as unrelated.

    Full comparison: M86.8X89 vs A54.43 →

  • A02.24— 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 salmonella moves the case to A02.24; the two are not reported together unless documented as unrelated.

    Full comparison: M86.8X89 vs A02.24 →

  • M96— 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 postprocedural osteopathies moves the case to M96; the two are not reported together unless documented as unrelated.

    Full comparison: M86.8X89 vs M96 →

  • M86.8X80— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a skull moves the case to M86.8X80.

    Full comparison: M86.8X89 vs M86.8X80 →

  • M86.8X81— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a face and sinuses moves the case to M86.8X81.

    Full comparison: M86.8X89 vs M86.8X81 →

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

Other osteomyelitis, other site is a billable ICD-10-CM diagnosis code (M86.8X89).

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

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

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 M86.8X89 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.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 221 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 6 MS-DRGs: DRG 456 (MDC 08), DRG 457 (MDC 08), DRG 458 (MDC 08), DRG 539 (MDC 08), DRG 540 (MDC 08), DRG 541 (MDC 08).

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

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

M86.8X29 — Other osteomyelitis, unspecified upper arm, M86.8X31 — Other osteomyelitis, right forearm, M86.8X32 — Other osteomyelitis, left forearm, M86.8X39 — Other osteomyelitis, unspecified forearm, M86.8X41 — Other osteomyelitis, right hand, M86.8X42 — Other osteomyelitis, left hand, M86.8X49 — Other osteomyelitis, unspecified hand, M86.8X51 — Other osteomyelitis, right thigh, M86.8X52 — Other osteomyelitis, left thigh, M86.8X59 — Other osteomyelitis, unspecified thigh, M86.8X61 — Other osteomyelitis, right lower leg, M86.8X62 — Other osteomyelitis, left lower leg, M86.8X69 — Other osteomyelitis, unspecified lower leg, M86.8X71 — Other osteomyelitis, right ankle and foot, M86.8X72 — Other osteomyelitis, left ankle and foot, M86.8X79 — Other osteomyelitis, unspecified ankle and foot, M86.8X80 — Other osteomyelitis, skull, M86.8X81 — Other osteomyelitis, face and sinuses, M86.8X9 — Other osteomyelitis, unspecified sites, M86.9 — Osteomyelitis, unspecified, +200 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Abscess”, “Tumor”; 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 (urinary), 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), +290 more

Contextual Map

Every relationship of M86.8X89 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 M86.8X89 with this related code in Claim Check

Hierarchy

Referenced by Code First instructions

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

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.

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 20, 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. "M86.8X89 — Other osteomyelitis, other site." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/m86.8x89-other-osteomyelitis-other-site

Change history

Changed in FY2027, the release in force: Added to the code set.

  • FY2027 — October 1, 2026
    Added to the code set
    Other osteomyelitis, other site
    FY2027 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M86.8X89 in its code family, with their registry titles.

View all codes in the M86 family