ICD-10-CM Code For Unspecified Parasitic Disease: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B89 includes parasitic infestations that are unspecified or not otherwise classified, covering general parasitic diseases when the exact etiologic agent is not identified. These ICD-10-CM diagnosis codes are used to document clinical encounters where a parasitic infestation is present but the specific parasite or precise diagnosis is unknown, capturing disease location, severity, or systemic involvement as applicable. Accurate coding within the ICD-10-CM B89 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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ICD-10-CM B89: Unspecified Parasitic Disease Overview

The diagnoses in this group represent parasitic infestations that are not specified to a particular organism or well-defined parasitic condition, affecting skin, mucous membranes, or internal organs depending on the infestation. These conditions fall under parasitology and infectious disease domains and may involve dermatologic, gastrointestinal, or systemic manifestations. Accurate coding matters because it ensures clinical encounters are documented correctly and supports appropriate claims processing and reimbursement.

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ICD-10-CM Code For Unspecified Parasitic Disease: Group Overview

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ICD-10-CM B89: Unspecified Parasitic Disease Overview

When to Use

Use a code from this group when documentation indicates a parasitic disease without specification of the parasite species or when no more specific ICD-10-CM code applies. Do not assign a more specific parasitic disease code if the record lacks definitive identification of the causative organism or specific infestation type.

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
B89	Unspecified parasitic disease

DRG Codes

3 rows

DRG Code	Description
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult patient presents to urgent care with several days of generalized pruritus and nonspecific skin irritation after returning from travel where they had exposure to poorly identified insects and contaminated water; skin exam shows excoriations without visible organisms or definitive signs of a specific parasitic infestation, and lab tests are non-diagnostic. A nonspecific parasitic infection is suspected but no organism is identified, so a code from this group is assigned when the clinician documents an unspecified parasitic disease. Typical codes: B89
A pediatric patient with chronic intermittent abdominal pain and weight loss is evaluated by primary care; extensive stool studies and serologies for common parasitic pathogens are negative or inconclusive, yet the clinician documents persistent parasitic infection of uncertain etiology pending further workup. Because the provider documents a parasitic disease without a confirmed causative organism, the unspecified parasitic disease code is used to capture the ongoing, unresolved diagnosis. Typical codes: B89
An elderly nursing home resident develops new-onset delirium and fever, with lab and imaging failing to identify a bacterial or viral source; clinicians consider a parasitic etiology but cannot obtain definitive identification due to limited specimen quality. To indicate a suspected parasitic process contributing as a comorbidity to the acute change in condition when the specific parasite is not identified, the unspecified parasitic disease code is assigned. Typical codes: B89

Related Codes

B85-PEDICULOSIS-AND-PHTHIRIASIS

ICD-10-CM Code For Pediculosis And Phthiriasis: Group Overview

B86-SCABIES-INFESTATION

ICD-10-CM Code For Scabies: Group Overview

B87-MYIASIS

ICD-10-CM Code For Myiasis: Group Overview

B88-OTHER-INFESTATIONS

ICD-10-CM Code For Other Infestations: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
B89	Unspecified parasitic disease

DRG Codes

3 rows

DRG Code	Description
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult patient presents to urgent care with several days of generalized pruritus and nonspecific skin irritation after returning from travel where they had exposure to poorly identified insects and contaminated water; skin exam shows excoriations without visible organisms or definitive signs of a specific parasitic infestation, and lab tests are non-diagnostic. A nonspecific parasitic infection is suspected but no organism is identified, so a code from this group is assigned when the clinician documents an unspecified parasitic disease. Typical codes: B89
A pediatric patient with chronic intermittent abdominal pain and weight loss is evaluated by primary care; extensive stool studies and serologies for common parasitic pathogens are negative or inconclusive, yet the clinician documents persistent parasitic infection of uncertain etiology pending further workup. Because the provider documents a parasitic disease without a confirmed causative organism, the unspecified parasitic disease code is used to capture the ongoing, unresolved diagnosis. Typical codes: B89
An elderly nursing home resident develops new-onset delirium and fever, with lab and imaging failing to identify a bacterial or viral source; clinicians consider a parasitic etiology but cannot obtain definitive identification due to limited specimen quality. To indicate a suspected parasitic process contributing as a comorbidity to the acute change in condition when the specific parasite is not identified, the unspecified parasitic disease code is assigned. Typical codes: B89

Related Codes

B85-PEDICULOSIS-AND-PHTHIRIASIS

ICD-10-CM Code For Pediculosis And Phthiriasis: Group Overview

B86-SCABIES-INFESTATION

ICD-10-CM Code For Scabies: Group Overview

B87-MYIASIS

ICD-10-CM Code For Myiasis: Group Overview

B88-OTHER-INFESTATIONS

ICD-10-CM Code For Other Infestations: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Unspecified Parasitic Disease: Group Overview

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ICD-10-CM B89: Unspecified Parasitic Disease Overview

ICD-10-CM Code For Unspecified Parasitic Disease: Group Overview

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ICD-10-CM B89: Unspecified Parasitic Disease Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM code group `B89` represent?

When should a clinician or coder use `B89` for documentation?

How does accurate use of `B89` affect claims and reimbursement?

What clinical areas or manifestations can be associated with diagnoses in the `B89` group?

Which related DRGs correspond to `B89` coded diagnoses?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM code group `B89` represent?

When should a clinician or coder use `B89` for documentation?

How does accurate use of `B89` affect claims and reimbursement?

What clinical areas or manifestations can be associated with diagnoses in the `B89` group?

Which related DRGs correspond to `B89` coded diagnoses?

References