I47.9 — Paroxysmal tachycardia, unspecified
I47.9 is a billable, specific ICD-10-CM code for paroxysmal tachycardia, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Bouveret (-Hoffman) syndrome
Excludes1 inherited from the categories above I47.9
These are not written on I47.9, but they bind it: a note on a category applies to every code beneath it. Billing I47.9 with anything listed here is a denial.
Other codes that can never be billed with I47.9
These codes carry an Excludes1 note pointing at I47.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I47.9 alone.
- R00.0Tachycardia, unspecified
Risk adjustment
I47.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 238 Specified Heart Arrhythmias0.299 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
I47.9 is named in 34 Medicare coverage policies — 34 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A54831Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemaker
- A54909Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers
How I47.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I47.9.
- Bouveret(-Hoffmann) syndrome (paroxysmal tachycardia)
- Hoffmann-Bouveret syndrome
- Disease, diseased›Bouveret(-Hoffmann) (paroxysmal tachycardia)
- Syndrome›Bouveret(-Hoffman)
- Tachycardia›paroxysmal(sustained) (nonsustained)
Code history
I47.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share I47. If I47.9 is not quite right, the correct code is usually one of these.
Questions about I47.9
- Is I47.9 a billable ICD-10-CM code?
- Yes. I47.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I47.9 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).
- What cannot be coded together with I47.9?
- I47.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I47.9 (I47) and apply to it just the same.