R00.1 Bradycardia, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Sinoatrial bradycardia
• Sinus bradycardia
• Slow heart beat
• Vagal bradycardia

Excludes1 (never code together)

• neonatal bradycardia (P29.12)

Use additional code

• code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Applies from R00 Abnormalities of heart beat

Excludes1 (never code together)

• abnormalities originating in the perinatal period (P29.1-)

Excludes2 (not included here)

• specified arrhythmias (I47-I49)

MS-DRG index

Defines the logic of DRG(s) 308-310 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 427.81 Sinoatrial node dysfunction (approximate)
• 427.89 Other specified cardiac dysrhythmias (approximate)

Code annotations containing back-references to R00.1

Back-references to R00.1

• Type 2 Excludes: I49 Other cardiac arrhythmias ("bradycardia NOS (R00.1)")
• Type 2 Excludes: I49 Other cardiac arrhythmias ("sinoatrial bradycardia (R00.1)")
• Type 2 Excludes: I49 Other cardiac arrhythmias ("sinus bradycardia (R00.1)")
• Type 2 Excludes: I49 Other cardiac arrhythmias ("vagal bradycardia (R00.1)")

Diagnosis Index entries for R00.1

• Brachycardia
• Bradycardia (sinoatrial) (sinus) (vagal)
• Heart beat › slow
• Sinus › bradycardia
• Slow › heart (beat)
• Syncope (near) (pre-) › bradycardia

Nearby codes

• R00 Abnormalities of heart beat
• R00.0 Tachycardia, unspecified
• R00.1 Bradycardia, unspecified (this code)
• R00.2 Palpitations
• R00.8 Other abnormalities of heart beat
• R00.9 Unspecified abnormalities of heart beat