Heart attack ICD-10-CM search: Acute myocardial infarction (I21) and the related coding concepts MedCoder holds for it. Concepts covered: Acute myocardial infarction, Subsequent myocardial infarction, Complications following myocardial infarction, Old myocardial infarction. Results are organised from ICD-10-CM, Coding Guidance, HCPCS Level II.
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources
Why these results?
How MedCoder read the search, which code set answered first, and why these codes are shown.
What MedCoder understood
You searched
heart attack
MedCoder understood
myocardial infarction
Search type
ICD-10-CM diagnosis / coding concept
Primary registry
ICD-10-CM
Primary concept
Acute myocardial infarction
“Heart attack” is coded in ICD-10-CM as myocardial infarction, and the tabular separates an initial acute infarction, a subsequent infarction within four weeks, current complications following an infarction, and an old (healed) infarction. The concepts below are those distinctions.
The ICD-10-CM count is capped at 31: the search stops counting there, so the registry may hold more.
Understood as a diagnosis or condition search, so ICD-10-CM is ranked first.
heart attack → myocardial infarction
Search results are not a code assignment. Review the documentation, official coding instructions, and applicable rules before selecting a code.
Coding pathways
The distinct coding situations the concept covers — acute, subsequent, history, complication, related condition — and the primary family’s own subdivisions.
What are you looking for?
Selecting a pathway filters the results below. It does not select a code.
Claim Check reads the official ICD-10-CM instructions for the codes entered. It is not a payer edit, a claims scrubber or a certified coding validator.
Related codes
Neighbouring concepts, the primary code’s own tabular relationships, and every code set’s full results.
Related coding concepts
Concepts ICD-10-CM keeps separate from the ones above. Each is shown only because the release carries codes for it.
These are related coding concepts, not interchangeable codes. The appropriate pathway depends on the documentation and coding circumstances.
Code titles, billable status and tabular instructions on this page are read from the published release files in force today: ICD-10-CM FY2027 (CMS and CDC), HCPCS October 2026 (CMS). Open a code to see its official instructions quoted as published, the release and file it came from, its relationships and its change history. A search result is MedCoder’s match of your words to those files, not a code assignment.