I20.1 — Angina pectoris with documented spasm
Is I20.1 billable?
Yes — I20.1 is billable for FY2027. I20.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I20.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I20.1 at a glance
| Code | I20.1 |
|---|---|
| Description | Angina pectoris with documented spasm |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I20.1 group to?
I20.1 sits in MDC 05 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 311Angina Pectorismedical
As a secondary diagnosis, I20.1 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is I20.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I20.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Prinzmetal angina
- Spasm, spastic, spasticity › cardiac (s)
- Spasm, spastic, spasticity › coronary (s)
- Spasm, spastic, spasticity › heart (s)
- Vasospasm › coronary (vasoconstriction)
- Angina › with › documented spasm (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
- Ischemia, ischemic › supply › due to vasospasm
Inclusion terms
Alternative wording in documentation that is classified to I20.1.
- Angiospastic angina
- Prinzmetal angina
- Spasm-induced angina
- Variant angina
Excludes1 — never code together — inherited from I20
The conditions below can never be reported together with I20.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from I20
Report an additional code alongside I20.1 to fully describe the condition. I20.1 is sequenced first.
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I20.1, but a patient may have both at the same time. When documentation supports it, I20.1 and the excluded code may both be reported.
- 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.-)
Code also — inherited from I20-I25
Two codes may be needed to describe the condition fully. Whether I20.1 is sequenced first depends on the reason for the encounter.
- the presence of hypertension (I10-I1A)
How long has I20.1 existed?
I20.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.