2026 ICD-10-CM Diagnosis Code B89Unspecified parasitic disease

ICD-10-CM Codes›A00–B99›B85-B89›B89

ICD-10-CM B89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B89 is a billable ICD-10-CM diagnosis code for unspecified parasitic disease. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B89
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified parasitic disease
Chapter
B85-B89
Pediculosis, acariasis and other infestations

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB85-B89Pediculosis, acariasis and other infestations
CategoryB89Unspecified parasitic disease
This CodeB89Unspecified parasitic disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis due to parasitic infection
  • Arthritis of lower limb due to parasitic infection
  • Cardiovascular abnormality due to infective myocarditis
  • Cyst of spinal cord caused by parasite
  • Cyst of spinal subdural space caused by parasite
  • Dilated cardiomyopathy due to infectious disease
  • Dilated cardiomyopathy due to parasitic myocarditis
  • Early neonatal parasitic infection
  • Enthesitis
  • Epilepsy due to parasitic disease
  • Fetal parasitic infection
  • Gastric ulcer due to parasitic infection
  • Glomerular disease due to infectious disease
  • Glomerular disease due to parasitic disease
  • Granuloma of spinal cord caused by parasite
  • Granuloma of spinal subdural space caused by parasite
  • Infection causing cyst of central nervous system
  • Infection causing granuloma of extradural space of spinal cord
  • Infection causing spinal epidural cyst
  • Infection causing spinal subdural cyst
  • Infection causing spondyloarthritis
  • Infection of anterior chamber of eye caused by parasite
  • Infection of bile duct caused by parasite
  • Infection of bursa caused by parasite
  • Infection of intervertebral disc caused by parasite
  • Infection of liver caused by parasite
  • Infection of orbit
  • Infection of respiratory tract caused by parasite
  • Infectious cirrhosis
  • Infectious panuveitis
  • Infective ulcer of esophagus
  • Nematode infestation of skin
  • Panuveitis caused by parasite
  • Parasitic chorioretinitis
  • Parasitic choroiditis
  • Parasitic cirrhosis
  • Parasitic cyst of orbit
  • Parasitic disease
  • Parasitic disease due to human immunodeficiency virus infection
  • Parasitic endophthalmitis
  • Parasitic eyelid infestation
  • Parasitic infection causing gastritis
  • Parasitic infection causing granuloma of cerebrum
  • Parasitic infection causing myelitis
  • Parasitic infection causing ulcer of esophagus
  • Parasitic infection of central nervous system
  • Parasitic infection of cranial nerve
  • Parasitic infection of lacrimal gland
  • Parasitic infection of lung
  • Parasitic infection of peripheral nerve
  • Parasitic infection of skin
  • Parasitic infection of vertebra
  • Parasitic infestation of bilateral eyelids
  • Parasitic infestation of left eyelid
  • Parasitic infestation of orbit
  • Parasitic infestation of right eyelid
  • Parasitic keratitis
  • Parasitic meningitis
  • Parasitic myocarditis
  • Parasitic myositis
  • Parasitic pericarditis
  • Parasitic peritonitis
  • Parasitic spinal cord compression
  • Parasitic tenosynovitis
  • Pneumonia due to parasitic infestation
  • Spinal epidural cyst caused by parasite
  • Spinal epidural granuloma caused by parasite
  • Spondyloarthritis caused by parasite
  • Trypanosomiasis with encephalitis

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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • due to or associated with
        • parasitic disease NEC
    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • in (due to)
        • parasitic disease NEC
    • Cyst(colloid) (mucous) (simple) (retention)
      • parasitic
    • Disease, diseased
      • parasitic
    • Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)
      • in (due to)
        • parasitic disease NEC
    • Hydrocephalus(acquired) (external) (internal) (malignant) (recurrent)
      • in (due to)
        • infectious disease NEC
    • Hydrocephalus(acquired) (external) (internal) (malignant) (recurrent)
      • in (due to)
        • parasitic disease
    • Infection, infected, infective(opportunistic)
      • parasitic
    • Infestation
      • eyelid
        • parasitic NOS
    • Infestation
      • orbit, parasitic NOS
    • Infestation
      • parasite, parasitic
    • Infestation
      • parasite, parasitic
        • eyelid
    • Iridocyclitis
      • in (due to)
        • parasitic disease NOS
    • Mastoiditis(coalescent) (hemorrhagic) (suppurative)
      • in (due to)
        • parasitic disease NEC
    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • in (due to)
        • parasitic disease NEC
    • Meningoencephalitis
      • parasitic NEC
    • Myopathy
      • in (due to)
        • parasitic disease NEC
    • Neuritis(rheumatoid)
      • acoustic (nerve)
        • in (due to)
          • parasitic disease NEC
    • Otitis(acute)
      • externa
        • in (due to)
          • parasitic disease NEC
    • Palsy
      • cranial nerve
        • multiple
          • in
            • parasitic disease
    • Parasitic
      • disease NEC
    • Parasitism
    • Polyneuropathy(peripheral)
      • in (due to)
        • parasitic disease NEC

Clinical ClassificationClinical

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

CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Parasitic Endophthalmitis

    infection of the interior of the eye, especially the aqueous and/or vitreous humor, by a parasite.

  • Enthesitis

    inflammation at the site of insertion of ligaments, tendons, and other fibrous structures into bone.

  • Enthesitis-Related Arthritis|ERA|ERA|Enthesitis-Related JIA|Enthesitis-Related JIA|Enthesitis-Related Juvenile Idiopathic Arthritis|Enthesitis-Related Juvenile Idiopathic Arthritis

    a category of juvenile idiopathic arthritis associated with arthritis and enthesitis, which may involve the axial skeleton. it is a form of juvenile spondyloarthritis.

Patient EducationClinical

Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Read the full article at MedlinePlus

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

Convert B89 to ICD-9-CMHistory

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

ICD-9-CM
136.9 Infect/parasite dis NOS
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 B89Overview

Is B89 (Unspecified parasitic disease) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified parasitic disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B89 group to?

When unspecified parasitic disease is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B89?

Under the General Equivalence Mappings, unspecified parasitic disease converts to ICD-9-CM 136.9 (infect/parasite dis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.