ICD-10-CM 2027
ICD-10 code for IST
From the official ICD-10-CM alphabetic index entry “IST (inappropriate sinus tachycardia, so stated)”. Page updated September 29, 2026.
About coding IST
The ICD-10-CM code for IST is I47.11 (Inappropriate sinus tachycardia, so stated).
Within I47.1 (supraventricular tachycardia), I47.11 is specifically for inappropriate sinus tachycardia, so stated. Related codes cover unspecified (I47.10) and other supraventricular tachycardia (I47.19).
Code first tachycardia complicating: abortion or ectopic or molar pregnancy (O00-O07, O08.8) and obstetric surgery and procedures (O75.4).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about IST ICD-10 codes
What is the ICD-10 code for IST?
- I47.11 — Inappropriate sinus tachycardia, so stated.
Is I47.11 billable?
- Yes. I47.11 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I47.11 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I47.11 as a principal diagnosis.
Is I47.11 a CC or MCC?
- I47.11 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.