What does ICD-10 code I44.6 mean?

ICD-10 code I44.6 is the standardized code used for other and unspecified fascicular block in medical records and coding systems.

When is ICD-10 code I44.6 used?

Doctors, hospitals, and insurers may use ICD-10 code I44.6 when recording other and unspecified fascicular block in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code I44.6 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code I44.6: Other and unspecified fascicular block

Name: ICD-10 Code I44.6: Other and unspecified fascicular block
Creator: HealthAssure Clinical Team
Published: 2026-05-26T05:25:39.445Z

I44.6 is an ICD-10 diagnosis entry used to group records related to Other and unspecified fascicular block. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

May be used when a clinician documents other and unspecified fascicular block in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

9Diseases of the circulatory system (I00-I99)

block

I30-I5AOther forms of heart disease

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

CardiologistGeneral Physician

Sibling codes

I44.0Atrioventricular block, first degreebillable I44.1Atrioventricular block, second degreebillable I44.2Atrioventricular block, completebillable I44.3Other and unspecified atrioventricular block I44.4Left anterior fascicular blockbillable I44.5Left posterior fascicular blockbillable I44.7Left bundle-branch block, unspecifiedbillable

Mapped diagnoses and classifications

SNOMED_CT 2374000high

Monofascicular block

Source: SNOMED International ICD-10 map

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

I44.6

Replacement codes

I44.60 — Unspecified fascicular blockI44.69 — Other fascicular block

Common synonyms

Other and unspecified fascicular blockOther and fascicular block

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.