I49.5 — Sick sinus syndrome
I49.5 is a billable, specific ICD-10-CM code for sick sinus syndrome. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Tachycardia-bradycardia syndrome
Risk adjustment
I49.5 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
I49.5 is named in 32 Medicare coverage policies — 32 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- 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
- A54929Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers – Coding and Billing
How I49.5 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 I49.5.
- Bradytachycardia
- Pause, sinoatrial
- Bradycardia›tachycardia syndrome
- Dysfunction›sinoatrial node
- Sick›sinus(syndrome)
- Syndrome›bradycardia-tachycardia
- Syndrome›tachycardia-bradycardia
- Tachycardia›sick sinus
- Syndrome›sick›sinus
- Tachycardia›paroxysmal›with sinus bradycardia
Related codes at this level
Codes that share I49. If I49.5 is not quite right, the correct code is usually one of these.
Questions about I49.5
- Is I49.5 a billable ICD-10-CM code?
- Yes. I49.5 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I49.5 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).