AutoICD API

I21.9

Billable

Acute myocardial infarction, unspecified

Acute myocardial infarction, unspecified

Status

Billable / Specific

Block

I20-I25

Parent Code

I21

Coding Notes

Inclusion Terms

Alternative clinical terms for this condition

  • Myocardial infarction (acute) NOS

Includes

Conditions included under this code

  • cardiac infarction
  • coronary (artery) embolism
  • coronary (artery) occlusion
  • coronary (artery) rupture
  • coronary (artery) thrombosis
  • infarction of heart, myocardium, or ventricle
  • myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset

Excludes 2

Conditions not included here, but the patient may have both

  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)
  • old myocardial infarction (I25.2)
  • postmyocardial infarction syndrome (I24.1)
  • subsequent type 1 myocardial infarction (I22.-)

Use Additional Code

Additional codes that should follow this code

  • code, if applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Code Also

A second code may be required; sequencing depends on circumstances

  • the presence of hypertension (I10-I1A)

Also Known As / Clinical Terms

SNOMED CT

UMLS

Frequently Asked Questions

What is ICD-10 code I21.9?

ICD-10-CM code I21.9 represents "Acute myocardial infarction, unspecified". It is a billable/specific code that can be used on a claim.

Is I21.9 a billable code?

Yes, I21.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.

What chapter is I21.9 in?

I21.9 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).

Are additional codes required with I21.9?

Yes, when using I21.9 you should also code: code, if applicable, to identify:; exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); occupational exposure to environmental tobacco smoke (Z57.31); status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82); tobacco dependence (F17.-); tobacco use (Z72.0).

What SNOMED CT codes does I21.9 map to?

I21.9 maps to 54 SNOMED CT concepts: 57054005, 304914007, 54329005, 52035003, 70211005, and 49 more. SNOMED CT is a clinical terminology used in electronic health records.

What are the UMLS CUIs for I21.9?

I21.9 is linked to 1 UMLS Concept Unique Identifier: C0155626. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.

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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.