DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I20 Angina pectoris

  • Header · not billable

I20 is not billable. The category heads 6 billable codes in FY2027, grouped under 5 subdivisions.

Index → code

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I20-I25 Ischemic heart diseases (I20-I25)
  3. I20 Angina pectoris
Billable codes
6
Subdivisions
5
CC / MCC codes
3 / 0
HCC V28 codes
1
New FY2027
0
Index entries
36

Codes in I20

  1. I20.0
    Unstable angina
    BillableCC229
    Inclusion terms 6

    Inclusion terms

    • Accelerated angina
    • Crescendo angina
    • De novo effort angina
    • Intermediate coronary syndrome
    • Preinfarction syndrome
    • Worsening effort angina
  2. I20.1
    Angina pectoris with documented spasm
    BillableCC
    Inclusion terms 4

    Inclusion terms

    • Angiospastic angina
    • Prinzmetal angina
    • Spasm-induced angina
    • Variant angina
  3. I20.2
    Refractory angina pectoris
    BillableCC
  4. I20.8
    Other forms of angina pectoris
    Header
    Use additional code 1

    Use additional code

    • code(s) for symptoms associated with angina equivalent
  5. I20.81
    Angina pectoris with coronary microvascular dysfunction
    Billable
    Inclusion terms 1

    Inclusion terms

    • Angina pectoris with coronary microvascular disease
  6. I20.89
    Other forms of angina pectoris
    Billable
    Inclusion terms 5

    Inclusion terms

    • Angina equivalent
    • Angina of effort
    • Coronary slow flow syndrome
    • Stable angina
    • Stenocardia
  7. I20.9
    Angina pectoris, unspecified
    Billable
    Inclusion terms 4

    Inclusion terms

    • Angina NOS
    • Anginal syndrome
    • Cardiac angina
    • Ischemic chest pain

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At I20

Excludes1

  • angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-) I25.1
  • atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-) I25.7
  • postinfarction angina (I23.7) I23.7

Use additional code

  • code to identify:
  • exposure to environmental tobacco smoke (Z77.22) Z77.22
  • history of tobacco dependence (Z87.891) Z87.891
  • occupational exposure to environmental tobacco smoke (Z57.31) Z57.31
  • tobacco dependence (F17.-) F17
  • tobacco use (Z72.0) Z72.0

Notes that also apply

Block I20-I25 instructions (Code also 1): printed on the block page.

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Prinzmetal angina → I20.1
  • Likoff's syndrome → I20.89
  • Schaufenster krankheit → I20.89
  • Stenocardia → I20.89
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) → I20.9
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)unstable → I20.0
  • Impendingcoronary syndrome → I20.0
  • Impendingmyocardial infarction → I20.0
  • Infarct, infarctionimpending (myocardium) → I20.0
  • Syndromeimpending coronary → I20.0
  • Syndromeintermediate coronary (artery) → I20.0
  • Syndromepreinfarction → I20.0
  • Spasm(s), spastic, spasticitycardiac → I20.1
  • Spasm(s), spastic, spasticitycoronary (artery) → I20.1
  • Spasm(s), spastic, spasticityheart → I20.1
  • Vasospasm (vasoconstriction)coronary → I20.1
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)refractory → I20.2
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)equivalent → I20.89
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)specified NEC → I20.89
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)stable → I20.89
  • Slowflow syndrome, coronary → I20.89
  • Syncope (near) (pre-)anginosa → I20.89
  • SyndromeHeberden's → I20.89
  • SyndromeLikoff's → I20.89
  • Syndromeslow flow, coronary → I20.89
  • Status (post)anginosus → I20.9
  • SyndromeX → I20.9
  • Syndromecoronaryinsufficiency or intermediate → I20.0
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)withdocumented spasm → I20.1
  • Ischemia, ischemicsupply (coronary)due to vasospasm → I20.1
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)withcoronary microvascular disease → I20.81
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)withcoronary microvascular dysfunction → I20.81
  • Syndromecoronaryslow flow → I20.89
  • Pain(s)chest (central)ischemic → I20.9
  • Dysfunctioncoronary microvascularwithangina pectoris → I20.81
  • Disease, diseasedcoronary (artery)microvascularwithangina pectoris → I20.81

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy