M84.431K
✓ BillablePathological fracture, right ulna, subsequent encounter for fracture with nonunion
Diseases of the musculoskeletal system and connective tissue (M00-M99)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • collapsed vertebra NEC (M48.5)
- • pathological fracture in neoplastic disease (M84.5-)
- • pathological fracture in osteoporosis (M80.-)
- • pathological fracture in other disease (M84.6-)
- • stress fracture (M84.3-)
- • traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)
⚠️ Excludes2
inheritedRules inherited from parent codes.
Clinical Description
ICD-10-CM code M84.431K represents pathological fracture, right ulna, subsequent encounter for fracture with nonunion. 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 8-character code at the 7th level of specificity. This is the most specific code available in this subcategory. Coders should note that M84.431K has 6 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code M84.431K?
ICD-10-CM code M84.431K is "Pathological fracture, right ulna, subsequent encounter for fracture with nonunion". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).
Is M84.431K a billable ICD-10 code?
Yes, M84.431K is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with M84.431K?
M84.431K has 6 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Can M84.431K be coded with other codes?
M84.431K has 2 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in M84.431
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)