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ICD-10-CM 2027 diagnosis code

I27.840Fontan-associated liver disease [FALD]

✓ Billable / specificCC — complication/comorbidity

I27.840 is a valid, billable ICD-10-CM code for fontan-associated liver disease [fald]. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I27.840

I27.840 is the ICD-10-CM diagnosis code for Fontan-associated liver disease [FALD]. It belongs to category I27 (other pulmonary heart diseases), block I26-I28 (pulmonary heart disease and diseases of pulmonary circulation) 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 I27.84 (Fontan related circulation), I27.840 is specifically for Fontan-associated liver disease [FALD]. Related codes cover Fontan-associated lymphatic dysfunction (I27.841), other Fontan-associated condition (I27.848) and unspecified (I27.849).

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 441 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC, relative weight 1.8219), DRG 442 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC, relative weight 0.9602) and DRG 443 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC, relative weight 0.6885), in MDC 07 (Diseases and Disorders of the Hepatobiliary System and Pancreas), 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 FY2026, effective October 1, 2025.

Notes that apply from higher levels

Instructions written at a parent level also apply to I27.840.

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

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to I27.840.

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
  • FY2026 (effective 10/1/2025): Added
  • No changes since FY2026.

Common questions about I27.840

Is I27.840 billable?

Yes. I27.840 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I27.840 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I27.840 as a principal diagnosis.

Is I27.840 a CC or MCC?

I27.840 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I27.840 group to?

I27.840 is used in the MS-DRG v44.0 logic for MS-DRG 441 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCC), MS-DRG 442 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CC) and MS-DRG 443 (Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.