M84.371

⚠ Non-billable (Header)

Stress fracture, right ankle

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

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

M84.3

• pathological fracture NOS (M84.4.-)
• pathological fracture due to osteoporosis (M80.-)
• traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)

⚠️ Excludes2

inherited

Rules inherited from parent codes.

M84.3

• personal history of (healed) stress (fatigue) fracture (Z87.312)
• stress fracture of vertebra (M48.4-)

M84

• traumatic fracture of bone-see fracture, by site

📋 Code Instructions

inherited

M84.3

• external cause code(s) to identify the cause of the stress fracture

Child Codes (6)

M84.371AStress fracture, right ankle, initial encounter for fracture✓ Billable M84.371DStress fracture, right ankle, subsequent encounter for fracture with routine healing✓ Billable M84.371GStress fracture, right ankle, subsequent encounter for fracture with delayed healing✓ Billable M84.371KStress fracture, right ankle, subsequent encounter for fracture with nonunion✓ Billable M84.371PStress fracture, right ankle, subsequent encounter for fracture with malunion✓ Billable M84.371SStress fracture, right ankle, sequela✓ Billable

Clinical Description

ICD-10-CM code M84.371 represents stress fracture, right ankle. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 7-character code at the 6th level of specificity. There are 6 more specific child codes under M84.371. Coders should note that M84.371 has 3 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code M84.371?

ICD-10-CM code M84.371 is "Stress fracture, right ankle". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).

Is M84.371 a billable ICD-10 code?

No, M84.371 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with M84.371?

M84.371 has 3 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Can M84.371 be coded with other codes?

M84.371 has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in M84.37

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

M84.372Stress fracture, left ankle M84.373Stress fracture, unspecified ankle M84.374Stress fracture, right foot M84.375Stress fracture, left foot M84.376Stress fracture, unspecified foot M84.377Stress fracture, right toe(s)M84.378Stress fracture, left toe(s)M84.379Stress fracture, unspecified toe(s)

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Code Information

CodeM84.371

BillableNo — Header code

ParentM84.37

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

Excludes13 rule(s)

Excludes23 note(s)

Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)