I45.3 — Trifascicular block
I45.3 is a billable, specific ICD-10-CM code for trifascicular block. It is valid for submission on a claim.
Risk adjustment
I45.3 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
I45.3 is named in 31 Medicare coverage policies — 31 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52423Billing and Coding: Infliximab and biosimilars
- A54831Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemaker
- A54909Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers
- A54926Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers
How I45.3 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 I45.3.
- Block, blocked›trifascicular
Related codes at this level
Codes that share I45. If I45.3 is not quite right, the correct code is usually one of these.
Questions about I45.3
- Is I45.3 a billable ICD-10-CM code?
- Yes. I45.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I45.3 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).