ICD-10-CM diagnosis code
M97.21XA Periprosthetic fracture around internal prosthetic right ankle joint, initial encounter
- Billable
- Yes, a complete code (FY2026)
- Category
- M97
Encounter (7th character)
This code is for the initial encounter: the patient is receiving active treatment for the condition (for example surgery, an emergency department visit or evaluation by a new clinician).
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Other codes in M97
36 complete codes in this category.
- M97.11XAPeriprosthetic fracture around internal prosthetic right knee joint, initial encounter
- M97.11XDPeriprosthetic fracture around internal prosthetic right knee joint, subsequent encounter
- M97.11XSPeriprosthetic fracture around internal prosthetic right knee joint, sequela
- M97.12XAPeriprosthetic fracture around internal prosthetic left knee joint, initial encounter
- M97.12XDPeriprosthetic fracture around internal prosthetic left knee joint, subsequent encounter
- M97.12XSPeriprosthetic fracture around internal prosthetic left knee joint, sequela
- M97.21XAPeriprosthetic fracture around internal prosthetic right ankle joint, initial encounter
- M97.21XDPeriprosthetic fracture around internal prosthetic right ankle joint, subsequent encounter
- M97.21XSPeriprosthetic fracture around internal prosthetic right ankle joint, sequela
- M97.22XAPeriprosthetic fracture around internal prosthetic left ankle joint, initial encounter
- M97.22XDPeriprosthetic fracture around internal prosthetic left ankle joint, subsequent encounter
- M97.22XSPeriprosthetic fracture around internal prosthetic left ankle joint, sequela
Documentation tips
- Make sure the note supports every element of the title, “Periprosthetic fracture around internal prosthetic right ankle joint, initial encounter”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M97.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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