I22 ICD-10-CA category: Subsequent myocardial infarction
I22 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.
Official description
I22Subsequent myocardial infarction
ICD-10-CA · Canada
Codes in I22
I22 isn’t a code on its own. Open the code that matches what the note documents.
Notes for I22
As CIHI prints them, with any note I22 takes from the headings above it.
Includes
- Myocardial infarction:• further extension (of)• recurrent• reinfarction
- With mention of hypertension (I10-I15)From I20-I25 Ischaemic heart diseases
Use additional code
Add a code for this detail when the note documents it.
- Use additional code from category (E10-E14) with fourth and fifth characters .52 to classify any associated diabetes mellitus.
- Use additional code from subcategory (R94.3-) to identify abnormal results of cardiovascular function studies
- Use additional code to identify presence of hypertension.From I20-I25 Ischaemic heart diseases
Excludes
Conditions classified elsewhere.
- Specified as chronic or with a stated duration of more than 4 weeks (more than 28 days) from onset (I25.8)
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)systemic connective tissue disorders (M30-M36)transient cerebral ischaemic attacks and related syndromes (G45.-)From Chapter 9: Diseases of the circulatory system (I00-I99)
Note
- For morbidity coding, this category should be assigned for infarction of any myocardial site, occurring within 4 weeks (28 days) from onset of a previous infarction
- For morbidity, duration as used in categories (I21, I22, I24 and I25) refers to the interval elapsing between onset of the ischaemic episode and admission to care.From I20-I25 Ischaemic heart diseases
Where I22 sits
- 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
- 2Block I20-I25Ischaemic heart diseases
- 3Category I22Subsequent myocardial infarction
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is I22 a valid ICD-10-CA code?
No. I22 (Subsequent myocardial infarction) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.
Where is I22 in ICD-10-CA?
I22 sits under I20-I25 Ischaemic heart diseases, within Chapter 9: Diseases of the circulatory system (I00-I99).
What coding notes apply to I22?
ICD-10-CA lists Note, Includes, Use additional code, Excludes notes for I22, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.