2027 ICD-10-CM Diagnosis Code B89Unspecified parasitic disease

ICD-10-CM Codes›A00–B99›B85-B89›B89

ICD-10-CM B89
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B89 is a billable ICD-10-CM diagnosis code for unspecified parasitic disease. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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
Short Description
Unspecified parasitic disease
Same as the full description in the CMS dataset.
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
  • Bilateral parasitic conjunctivitis
  • 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 respiratory tract caused by parasite
  • Infectious cirrhosis
  • Infectious panuveitis
  • Infective ulcer of esophagus
  • Infestation of bilateral orbits caused by parasite
  • Nematode infestation of skin
  • Panuveitis caused by parasite
  • Parasitic chorioretinitis
  • Parasitic choroiditis
  • Parasitic cirrhosis
  • Parasitic conjunctivitis
  • Parasitic conjunctivitis of left eye
  • Parasitic conjunctivitis of right eye
  • 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 left orbit
  • Parasitic infestation of orbit
  • Parasitic infestation of right eyelid
  • Parasitic infestation of right orbit
  • 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B89: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name B89, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and B89 is one of the conditions named.

  • H22 Disorders of iris and ciliary body in diseases classified elsewhere
    parasitic disease (B89)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B89Overview

What is the ICD-10 code for unspecified parasitic disease?

The ICD-10-CM code for unspecified parasitic disease is B89. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 869, 868, with relative weights from 0.6784 to 2.1855 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.