Is I45.5 a billable ICD-10-CM code?

Yes. I45.5 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I45.5 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 I45.5?

I45.5 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

I45.5

I45.5 — Other specified heart block

Billable / specific codeICD-10-CM

I45.5 is a billable, specific ICD-10-CM code for other specified heart block. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

heart block NOS (I45.9)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Sinoatrial block
Sinoauricular block

Risk adjustment

I45.5 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

I45.5 is named in 21 Medicare coverage policies — 21 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
A54926Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers
A54958Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemaker
A54982Billing and Coding: Single Chamber and Dual Chamber Permanent Cardiac Pacemakers

How I45.5 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 I45.5.

Arborization block(heart)
Arrest, arrested›sinus
Block, blocked›arborization(heart)
Block, blocked›nodal
Block, blocked›sinoatrial
Block, blocked›sinoauricular
Sinus›arrest
Sinus›pause
Standstill›auricular
Standstill›sinoatrial
Block, blocked›heart›specified type NEC

Related codes at this level

Codes that share I45. If I45.5 is not quite right, the correct code is usually one of these.

Questions about I45.5

Is I45.5 a billable ICD-10-CM code?: Yes. I45.5 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I45.5 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 I45.5?: I45.5 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.