2026 ICD-10-CM Diagnosis Code B18.0Chronic viral hepatitis B with delta-agent

ICD-10-CM Codes›A00–B99›B15-B19›B18

ICD-10-CM B18.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B18.0 is a billable ICD-10-CM diagnosis code for chronic viral hepatitis B with delta-agent. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 441 through 443. Coders also document this condition as chronic type B viral hepatitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hepatitis and Viral infection.

Code Identity

ICD-10-CM Code
B18.0
Billable Status
Yes — Valid for Submission
Code Describes
Chronic viral hepatitis B with delta-agent
Short Description
Chronic viral hepatitis B with delta-agent
Same as the full description in the CMS dataset.
Parent Code
B18
Chronic viral hepatitis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB15-B19Viral hepatitis
CategoryB18Chronic viral hepatitis
This CodeB18.0Chronic viral hepatitis B with delta-agent

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic type B viral hepatitis
  • Chronic viral hepatitis B with hepatitis D
  • Chronic viral hepatitis D
  • Hepatic coma due to chronic hepatitis B
  • Hepatic coma due to chronic hepatitis B with delta agent
  • Hepatic coma due to viral hepatitis B
  • Hepatic coma due to viral hepatitis D
  • Viral hepatitis D

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Hepatitis
      • B
        • chronic
          • with delta-agent
    • Hepatitis
      • D
        • chronic
    • Hepatitis
      • viral, virus
        • chronic
          • type
            • B
              • with delta-agent
    • Hepatitis
      • viral, virus
        • chronic
          • type
            • D
    • Hepatitis
      • viral, virus
        • type
          • B
            • chronic
              • with delta-agent
    • Hepatitis
      • viral, virus
        • type
          • D
            • chronic

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF007
Hepatitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Hepatitis B

Hepatitis is inflammation of the liver. Inflammation is swelling that happens when tissues of the body are injured or infected. It can damage your liver. This swelling and damage can affect how well your liver functions.

The full article covers:

  • What is hepatitis?
  • What is hepatitis B?
  • What causes hepatitis B?
  • Who is at risk for hepatitis B?
  • What are the symptoms of hepatitis B?
  • What other problems can hepatitis B cause?
  • How is hepatitis B diagnosed?
  • What are the treatments for hepatitis B?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert B18.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
070.33 Hpt B chrn wo cm w dlta
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B18.0Overview

Is B18.0 (Chronic viral hepatitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic viral hepatitis B with delta-agent on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B18.0 group to?

When chronic viral hepatitis B with delta-agent is the principal diagnosis on an inpatient stay, it groups to MS-DRG 441, 442, 443, with relative weights from 0.6997 to 1.7947 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B18.0?

Under the General Equivalence Mappings, chronic viral hepatitis B with delta-agent converts to ICD-9-CM 070.33 (hpt B chrn wo cm w dlta). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.