ICD-10-CM 2027
ICD-10 code for angina
From the official ICD-10-CM alphabetic index entry “Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)”. Page updated September 29, 2026.
About coding angina
The ICD-10-CM code for angina is I20.9 (Angina pectoris, unspecified). The official index lists 33 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I20.9.
Within I20, choose I20.9 (unspecified) only when documentation doesn't support a more specific option: unstable angina (I20.0), with documented spasm (I20.1), refractory angina pectoris (I20.2) and other forms of angina pectoris (I20.8).
Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and tobacco use (Z72.0).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific angina codes (official index)
- with
- atherosclerotic heart disease
- coronary microvascular disease I20.81 — Angina pectoris with coronary microvascular dysfunction
- coronary microvascular dysfunction I20.81 — Angina pectoris with coronary microvascular dysfunction
- documented spasm I20.1 — Angina pectoris with documented spasm
- abdominal K55.1 — Chronic vascular disorders of intestine
- accelerated
- agranulocytic
- angiospastic
- aphthous B08.5 — Enteroviral vesicular pharyngitis
- crescendo
- croupous J05.0 — Acute obstructive laryngitis [croup]
- cruris I73.9 — Peripheral vascular disease, unspecified
- de novo effort
- diphtheritic, membranous A36.0 — Pharyngeal diphtheria
- equivalent I20.89 — Other forms of angina pectoris
- exudative, chronic J37.0 — Chronic laryngitis
- following acute myocardial infarction I23.7 — Postinfarction angina
- gangrenous diphtheritic A36.0 — Pharyngeal diphtheria
- intestinal K55.1 — Chronic vascular disorders of intestine
- Ludovici K12.2 — Cellulitis and abscess of mouth
- Ludwig's K12.2 — Cellulitis and abscess of mouth
- malignant diphtheritic A36.0 — Pharyngeal diphtheria
- membranous J05.0 — Acute obstructive laryngitis [croup]
- diphtheritic A36.0 — Pharyngeal diphtheria
- Vincent's A69.1 — Other Vincent's infections
- mesenteric K55.1 — Chronic vascular disorders of intestine
- monocytic
- of effort
- phlegmonous J36 — Peritonsillar abscess
- diphtheritic A36.0 — Pharyngeal diphtheria
- post-infarctional I23.7 — Postinfarction angina
- pre-infarctional
- Prinzmetal
- progressive
- pseudomembranous A69.1 — Other Vincent's infections
- pultaceous, diphtheritic A36.0 — Pharyngeal diphtheria
- refractory I20.2 — Refractory angina pectoris
- spasm-induced
- specified NEC I20.89 — Other forms of angina pectoris
- stable I20.89 — Other forms of angina pectoris
- stenocardia
- stridulous, diphtheritic A36.2 — Laryngeal diphtheria
- tonsil J36 — Peritonsillar abscess
- trachealis J05.0 — Acute obstructive laryngitis [croup]
- unstable I20.0 — Unstable angina
- variant
- Vincent's A69.1 — Other Vincent's infections
- worsening effort
Common questions about angina ICD-10 codes
What is the ICD-10 code for angina?
- I20.9 — Angina pectoris, unspecified. More specific codes apply when the documentation supports them: I20.81, I20.81, I20.1, K55.1 and others below.
What is the ICD-10 code for abdominal angina?
- K55.1 — Chronic vascular disorders of intestine.
What is the ICD-10 code for aphthous angina?
- B08.5 — Enteroviral vesicular pharyngitis.
What is the ICD-10 code for croupous angina?
- J05.0 — Acute obstructive laryngitis [croup].
What is the ICD-10 code for cruris angina?
- I73.9 — Peripheral vascular disease, unspecified.
What is the ICD-10 code for equivalent angina?
- I20.89 — Other forms of angina pectoris.
What is the ICD-10 code for gangrenous diphtheritic angina?
- A36.0 — Pharyngeal diphtheria.
Is I20.9 billable?
- Yes. I20.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I20.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I20.9 as a principal diagnosis.
Is I20.9 a CC or MCC?
- No. I20.9 is neither a CC nor an MCC under MS-DRG v44.0.