2026 ICD-10-CM Diagnosis Code Z20.7Contact with and (suspected) exposure to pediculosis, acariasis and other infestations

ICD-10-CM Codes›Z00–Z99›Z20-Z29›suspected

ICD-10-CM Z20.7
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z20.7 is a billable ICD-10-CM diagnosis code for contact with and (suspected) exposure to pediculosis, acariasis and other infestations. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as exposure to disease caused by ectoparasite. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Exposure, encounters, screening or contact with infectious disease.

Code Identity

ICD-10-CM Code
Z20.7
Billable Status
Yes — Valid for Submission
Code Describes
Contact with and (suspected) exposure to pediculosis, acariasis and other infestations
Short Description
Cntct w & expsr to pediculosis, acariasis & oth infestations
Parent Code
Z20
Contact with and (suspected) exposure to communicable diseases

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ20-Z29Persons with potential health hazards related to communicable diseases
CategorysuspectedContact with and exposure to communicable diseases (Z20)
This CodeZ20.7Contact with and (suspected) exposure to pediculosis, acariasis and other infestations

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z20.7.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Exposure to disease caused by ectoparasite
  • Exposure to Enterobius vermicularis
  • Exposure to Leptospira
  • Exposure to Pediculus humanus capitus
  • Exposure to Plasmodium falciparum
  • Exposure to scabies
  • Exposure to Toxoplasma

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.

    • Contact(with)
      • acariasis
    • Contact(with)
      • infestation (parasitic) NEC
    • Contact(with)
      • parasitic disease
    • Contact(with)
      • pediculosis
    • Exposure(to)
      • acariasis
    • Exposure(to)
      • infestation (parasitic) NEC
    • Exposure(to)
      • parasitic disease NEC
    • Exposure(to)
      • pediculosis

Clinical ClassificationClinical

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

CCSR FAC016
Exposure, encounters, screening or contact with infectious disease
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Body Lice

Body lice (also called clothes lice) are tiny insects which live and lay nits (lice eggs) on clothing. They are parasites, and they need to feed on human blood to survive. They usually only move to the skin to feed.

The full article covers:

  • What are body lice?
  • How do body lice spread?
  • Who is at risk for body lice?
  • What are the symptoms of body lice?
  • How do you know if you have body lice?
  • What are the treatments for body lice?

Read the full article at MedlinePlus

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

Convert Z20.7 to ICD-9-CMHistory

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

ICD-9-CM
V01.89 Communic dis contact NEC
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 Z20.7Overview

Is Z20.7 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report contact with and (suspected) exposure to pediculosis, acariasis and other infestations on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z20.7 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because contact with and (suspected) exposure to pediculosis, acariasis and other infestations describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of Z20.7?

Under the General Equivalence Mappings, contact with and (suspected) exposure to pediculosis, acariasis and other infestations converts to ICD-9-CM V01.89 (communic dis contact NEC). The mapping is approximate, so confirm the match fits the documentation.