2027 ICD-10-CM Diagnosis Code Z57.31Occupational exposure to environmental tobacco smoke

ICD-10-CM Codes›Z00–Z99›Z55-Z65›Z57

ICD-10-CM Z57.31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z57.31 is a billable ICD-10-CM diagnosis code for occupational exposure to environmental tobacco smoke. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Socioeconomic/psychosocial factors.

Code Identity

ICD-10-CM Code
Z57.31
Billable Status
Yes — Valid for Submission
Code Describes
Occupational exposure to environmental tobacco smoke
Short Description
Occupational exposure to environmental tobacco smoke
Same as the full description in the CMS dataset.
Parent Code
Z57.3
Occupational exposure to other air contaminants

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ55-Z65Persons with potential health hazards related to socioeconomic and psychosocial circumstances
CategoryZ57Occupational exposure to risk factors
This CodeZ57.31Occupational exposure to environmental tobacco smoke

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z57.31.

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.

Present on Admission (POA)Billing

Z57.31 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Occupational exposure to environmental tobacco smoke

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z57.31: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.

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.

  • exposure to environmental tobacco smoke (Z77.22)

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z57.31, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Z57.31: they are not reported together with it, unless the two conditions are unrelated.

  • Z13.88 Encounter for screening for disorder due to exposure to contaminants
    those exposed to contaminants without suspected disorders (Z57.-, Z77.-) names Z57.-, which includes this code

Excludes2 5

These codes carry an Excludes2 note naming Z57.31: its condition is not part of those codes, and both may be reported when the patient has both.

  • Z77.22 Contact with and (suspected) exposure to environmental tobacco smoke (acute) (chronic)
    occupational exposure to environmental tobacco smoke (Z57.31)
  • Z56 Problems related to employment and unemployment
    occupational exposure to risk factors (Z57.-) names Z57.-, which includes this code
  • Z58 Problems related to physical environment
    occupational exposure (Z57.-) names Z57.-, which includes this code
  • Z77 Other contact with and (suspected) exposures hazardous to health
    occupational exposure to risk factors (Z57.-) names Z57.-, which includes this code
  • Z91 Personal risk factors, not elsewhere classified
    occupational exposure to risk factors (Z57.-) names Z57.-, which includes this code

Use Additional Code 40

These codes say to use an additional code from the note, and Z57.31 is one of the codes named.

  • C07 Malignant neoplasm of parotid gland
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C08 Malignant neoplasm of other and unspecified major salivary glands
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C09 Malignant neoplasm of tonsil
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C10 Malignant neoplasm of oropharynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C11 Malignant neoplasm of nasopharynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C12 Malignant neoplasm of pyriform sinus
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C13 Malignant neoplasm of hypopharynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C14 Malignant neoplasm of other and ill-defined sites in the lip, oral cavity and pharynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C32 Malignant neoplasm of larynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C33 Malignant neoplasm of trachea
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C34 Malignant neoplasm of bronchus and lung
    occupational exposure to environmental tobacco smoke (Z57.31)
  • C39 Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs
    occupational exposure to environmental tobacco smoke (Z57.31)
  • D00.0 Carcinoma in situ of lip, oral cavity and pharynx
    occupational exposure to environmental tobacco smoke (Z57.31)
  • D02 Carcinoma in situ of middle ear and respiratory system
    occupational exposure to environmental tobacco smoke (Z57.31)
  • G31.84 Mild cognitive impairment of uncertain or unknown etiology
    occupational exposure to environmental tobacco smoke (Z57.31)

25 more Use Additional Code notes name this code. Browse all Use Additional Code notes.

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; each main term links to its index entry.

Clinical ClassificationClinical

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

CCSR FAC019
Socioeconomic/psychosocial factors
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Occupational Health

Occupational health problems occur at work or because of the kind of work you do. These problems can include:

Read the full article at MedlinePlus

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

Convert Z57.31 to ICD-9-CMHistory

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

ICD-9-CM
V62.1 Adverse eff-work environ
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 Z57.31Overview

What is the ICD-10 code for occupational exposure to environmental tobacco smoke?

The ICD-10-CM code for occupational exposure to environmental tobacco smoke is Z57.31 (sometimes written as Z5731). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z57.31 (Occupational exposure to other air contaminants) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report occupational exposure to environmental tobacco smoke on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z57.31 group to?

On inpatient claims, occupational exposure to environmental tobacco smoke maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

Can Z57.31 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because occupational exposure to environmental tobacco smoke describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z57.31 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for occupational exposure to environmental tobacco smoke on inpatient claims. The code appears in the Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65) range of the CMS exempt list.