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M89.59 vs T84.05

M89.59 (Osteolysis, multiple sites) compared with T84.05 (Periprosthetic osteolysis of internal prosthetic joint), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because M89.59 lists T84.05 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.M89.59 is “Osteolysis, multiple sites”; T84.05 is “Periprosthetic osteolysis of internal prosthetic joint”. T84.05 is a non-billable header; M89.59 is billable. M89.59 sits in M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99); T84.05 in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

Yes, when both are documented.M89.59 lists T84.05 under Excludes2: “periprosthetic osteolysis of internal prosthetic joint (T84.05-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. M89.59 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.M89.59’s tabular entry: “periprosthetic osteolysis of internal prosthetic joint (T84.05-)”. The note covers T84.05.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

One is a header.T84.05 is a non-billable header, but M89.59 is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

M89.59
Osteolysis, multiple sites
↔
T84.05
Periprosthetic osteolysis of internal prosthetic joint

What we found

Yes, when both are documented.M89.59 carries an Excludes2 note covering T84.05: “periprosthetic osteolysis of internal prosthetic joint (T84.05-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

M89.59Osteolysis, multiple sitesT84.05Periprosthetic osteolysis of internal prosthetic joint
Billing statusBillableNon-billable header

Report instead: T84.050A, T84.050D, T84.050S, T84.051A, T84.051D

ClassificationM00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionOsteolysis, multiple sites is a billable ICD-10-CM diagnosis code (M89.59).Periprosthetic osteolysis of internal prosthetic joint is a non-billable ICD-10-CM category code (T84.05).
7th character—The appropriate 7th character is to be added to each code from category T84
Excludes1
postprocedural osteopathies (M96.-)
—
Excludes2
periprosthetic osteolysis of internal prosthetic joint (T84.05-)
failure and rejection of transplanted organs and tissues (T86.-)
fracture of bone following insertion of orthopedic implant, joint prosthesis or bone plate (M96.6)
any encounters with medical care for postprocedural conditions in which no complications are present, such as:
artificial opening status (Z93.-)
closure of external stoma (Z43.-)
fitting and adjustment of external prosthetic device (Z44.-)
burns and corrosions from local applications and irradiation (T20-T32)
complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
mechanical complication of respirator [ventilator] (J95.850)
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
postprocedural fever (R50.82)
specified complications classified elsewhere, such as:
cerebrospinal fluid leak from spinal puncture (G97.0)
colostomy malfunction (K94.0-)
disorders of fluid and electrolyte imbalance (E86-E87)
functional disturbances following cardiac surgery (I97.0-I97.1)
intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
ostomy complications (J95.0-, K94.-, N99.5-)
postgastric surgery syndromes (K91.1)
postlaminectomy syndrome NEC (M96.1)
postmastectomy lymphedema syndrome (I97.2)
postsurgical blind-loop syndrome (K91.2)
ventilator associated pneumonia (J95.851)
Use additional code
code to identify major osseous defect, if applicable (M89.7-)
code to identify major osseous defect, if applicable (M89.7-)
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
code(s) to identify the specified condition resulting from the complication

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources