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Z11 ICD-10-CM Code: Encounter for screening for infectious and parasitic diseases

Compare with another code for Z11Check this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

Tabular directives
1 inclusion term · 1 Excludes1 · 1 Excludes2

Category · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Excludes1Not reported with this code unless documented as unrelated
  • encounter for diagnostic examination-code to sign or symptom
Excludes2from Z00-Z13Not included here; may be reported together
  • examinations related to pregnancy and reproduction (Z30-Z36, Z39.-)
IncludesWhat this code covers
  • Screening is the testing for disease or disease precursors in asymptomatic individuals so that early detection and treatment can be provided for those who test positive for the disease.

Where it sits Source: CMS/NCHS

Under:Chapter 21: Factors Influencing Health Status and Contact with Health ServicesZ00-Z13 Persons encountering health services for examinations

Codes under Z11 (10)

  • Z11.0Encounter for screening for intestinal infectious diseasesBillable
  • Z11.1Encounter for screening for respiratory tuberculosisBillable
  • Z11.2Encounter for screening for other bacterial diseasesBillable
  • Z11.3Encounter for screening for infections with a predominantly sexual mode of transmissionBillable
  • Z11.4Encounter for screening for human immunodeficiency virus [HIV]Billable
  • Z11.5Encounter for screening for other viral diseasesNot billable
  • Z11.6Encounter for screening for other protozoal diseases and helminthiasesBillable
  • Z11.7Encounter for testing for latent tuberculosis infectionBillable
  • Z11.8Encounter for screening for other infectious and parasitic diseasesBillable
  • Z11.9Encounter for screening for infectious and parasitic diseases, unspecifiedBillable

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Z11 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on Z11 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Screening is the testing for disease or disease precursors in asymptomatic individuals so that early detection and treatment can be provided for those who test positive for the disease.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

  • encounter for diagnostic examination-code to sign or symptom

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from Z00-Z13

Coder workflow for Z11

MedCoder structured workflow — derived from this code’s own official record

Before you code Z11

  1. Z11 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewZ11.0, Z11.1, Z11.2, Z11.3, Z11.4, Z11.5, Z11.6, Z11.7, Z11.8, Z11.9

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. Confirm the reason for the encounter this Z code records: a screening — testing for disease in a patient without signs or symptoms; a test ordered for a documented sign, symptom or diagnosis is diagnostic, not screening. Check whether the code may be reported as first-listed or principal — some Z codes are limited to one position — and do not report a history or status code for a condition documented as current. Z code categories and their reporting positions (Guidelines I.C.21.c.5, I.C.21.c.15).

    Guide: Screening vs diagnostic →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with the code beneath Z11. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath Z11?
    Yes → Select that code and continue the checks below on its own page.
    No → Z11 cannot be reported as written. Where the codes beneath it include an unspecified code, that code applies when the record goes no further; otherwise query for the missing detail.

    ReviewZ11.0, Z11.1, Z11.2, Z11.3, Z11.4, Z11.5, Z11.6, Z11.7, Z11.8, Z11.9

  2. Does the documentation support a condition named in Z11’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

Report the code beneath Z11 that the documentation supports, not Z11 itself. Then confirm that code is valid for the date of service on its own page.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The reason for the encounter
Whether the code records the encounter’s purpose, a status, or a history — and whether it may be first-listed (Guidelines I.C.21.c).

Official instructions as workflow

  • Excludes1 — check before selecting Z11(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Z11: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of Z11(1 note)

    Coding workflow: The conditions named in this note are not included in Z11. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareZ39

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition Z11 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse Z11 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of Z11 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • Z30— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of examinations related to pregnancy and reproduction adds Z30; it is not part of this code and both may be reported when both are documented.

    Full comparison: Z11 vs Z30 →

  • Z36— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of examinations related to pregnancy and reproduction adds Z36; it is not part of this code and both may be reported when both are documented.

    Full comparison: Z11 vs Z36 →

  • Z39— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of examinations related to pregnancy and reproduction adds Z39; it is not part of this code and both may be reported when both are documented.

    Full comparison: Z11 vs Z39 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Encounter for screening for infectious and parasitic diseases is a non-billable ICD-10-CM category code (Z11). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

The screening Z codes/categories: Z11 Encounter for screening for infectious and parasitic diseases Z12 Encounter for screening for malignant neoplasms Z13 Encounter for screening for other diseases and disorders Except: Z13.9, Encounter for screening, unspecified Z36 Encounter for antenatal screening for mother

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name Z11 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes2 notes: Z00 — Encounter for general examination without complaint, suspected or reported diagnosis, Z01 — Encounter for other special examination without complaint, suspected or reported diagnosis.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Contextual Map

Every relationship of Z11 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Z11 with these 9 related codes in Claim Check

Hierarchy

Excludes2

Referenced by Excludes2 notes

Nearest codes (13)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Common coding questions

MedCoder editorial

Can Z11 be billed directly?

No. Z11 (Encounter for screening for infectious and parasitic diseases) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Z11 — Encounter for screening for infectious and parasitic diseases." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/z11-encounter-for-screening-for-infectious-and-parasitic-diseases

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Encounter for screening for infectious and parasitic diseases

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z11 in its code family, with their registry titles.