M87.171

✓ Billable

Osteonecrosis due to drugs, right ankle

Diseases of the musculoskeletal system and connective tissue (M00-M99)

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

M87

• juvenile osteonecrosis (M91-M92)
• osteochondropathies (M90-M93)

📋 Code Instructions

inherited

M87.1

• code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

M87

• code to identify major osseous defect, if applicable (M89.7-)

Clinical Description

ICD-10-CM code M87.171 represents osteonecrosis due to drugs, right ankle. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.

This is a 7-character code at the 6th level of specificity. This is the most specific code available in this subcategory. Coders should note that M87.171 has 2 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code M87.171?

ICD-10-CM code M87.171 is "Osteonecrosis due to drugs, right ankle". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).

Is M87.171 a billable ICD-10 code?

Yes, M87.171 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

What codes are excluded with M87.171?

M87.171 has 2 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in M87.17

Other codes in the same category that may be relevant for differential coding:

M87.172Osteonecrosis due to drugs, left ankle M87.173Osteonecrosis due to drugs, unspecified ankle M87.174Osteonecrosis due to drugs, right foot M87.175Osteonecrosis due to drugs, left foot M87.176Osteonecrosis due to drugs, unspecified foot M87.177Osteonecrosis due to drugs, right toe(s)M87.178Osteonecrosis due to drugs, left toe(s)M87.179Osteonecrosis due to drugs, unspecified toe(s)

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Code Information

CodeM87.171

BillableYes

ParentM87.17

CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)

Excludes12 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)