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ICD-10-CM 2027 diagnosis code

I48.11Longstanding persistent atrial fibrillation

✓ Billable / specificCC — complication/comorbidity

I48.11 is a valid, billable ICD-10-CM code for longstanding persistent atrial fibrillation. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2020 (effective October 1, 2019). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I48.11

I48.11 is the ICD-10-CM diagnosis code for Longstanding persistent atrial fibrillation. It belongs to category I48 (atrial fibrillation and flutter), block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I48.1 (persistent atrial fibrillation), I48.11 is specifically for Longstanding persistent atrial fibrillation. Related codes cover other persistent atrial fibrillation (I48.19).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 308 (Cardiac Arrhythmia and Conduction Disorders with MCC, relative weight 1.1806), DRG 309 (Cardiac Arrhythmia and Conduction Disorders with CC, relative weight 0.7316) and DRG 310 (Cardiac Arrhythmia and Conduction Disorders without CC/MCC, relative weight 0.568), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2020, effective October 1, 2019.

Notes that apply from higher levels

Instructions written at a parent level also apply to I48.11.

› From I48.1 Persistent atrial fibrillation
Excludes1
  • Permanent atrial fibrillation (I48.21)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to I48.11.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2020 (effective 10/1/2019): Added
  • No changes since FY2020.

Common questions about I48.11

Is I48.11 billable?

Yes. I48.11 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I48.11 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I48.11 as a principal diagnosis.

Is I48.11 a CC or MCC?

I48.11 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I48.11 group to?

I48.11 is used in the MS-DRG v44.0 logic for MS-DRG 308 (Cardiac Arrhythmia and Conduction Disorders with MCC), MS-DRG 309 (Cardiac Arrhythmia and Conduction Disorders with CC) and MS-DRG 310 (Cardiac Arrhythmia and Conduction Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.