Z77.22 ICD-10-CM Code: Contact with and (suspected) exposure to environmental tobacco smoke (acute) (chronic)

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Z77.22 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on Z77.22 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for Z77.22

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

Before you code Z77.22

1. Z77.22’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

   Guide: Combination codes →

2. Confirm the reason for the encounter this Z code records: the circumstance it records. 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, I.C.21.c.15).

   Guide: Z codes as principal or first-listed diagnosis →

3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with Z77.22. 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 a condition named in Z77.22’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.

   ReviewF17, Z72.0

Consider Z77.22. Then review the Code Also note, and confirm the code is valid for the date of service in the Verify section.

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).

Acuity

Acute or chronic as documented; when both are documented and separate codes exist, both are reported with the acute code first (Guidelines I.B.8).

The associated condition or complication

Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

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 Z77.22(2 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Z77.22: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareF17, Z72.0

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

• Excludes2 — not part of Z77.22(8 notes)

  Coding workflow: The conditions named in this note are not included in Z77.22. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareZ57.31, Z20, P96.81, P04, Z57, Z18

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

• Code Also — related condition(1 note)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

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

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.

Indexed As (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Circumstance phrases from the official ICD-10-CM External Cause of Injuries Index that map to this code.

• Exposure (to), smoke, tobacco, second hand

Indexed Clinical Terms (5)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Exposure (to), environmental tobacco smoke (acute) (chronic)
• Exposure (to), second hand tobacco smoke (acute) (chronic)
• Passive, smoking
• Second hand tobacco smoke exposure (acute) (chronic)
• Smoking, passive

Official Coding Guidelines

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

Don’t confuse Z77.22 with…

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

The codes most likely to be picked instead of Z77.22 — 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.

• F17— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of nicotine dependence moves the case to F17; the two are not reported together unless documented as unrelated.

  Full comparison: Z77.22 vs F17 →

• Z72.0— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of tobacco use moves the case to Z72.0; the two are not reported together unless documented as unrelated.

  Full comparison: Z77.22 vs Z72.0 →

• Z57.31— 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 occupational exposure to environmental tobacco smoke adds Z57.31; it is not part of this code and both may be reported when both are documented.

  Full comparison: Z77.22 vs Z57.31 →

• Z20— 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 contact with and (suspected) exposure to communicable diseases adds Z20; it is not part of this code and both may be reported when both are documented.

  Full comparison: Z77.22 vs Z20 →

• P96.81— 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 exposure to (parental) (environmental) tobacco smoke in the perinatal period adds P96.81; it is not part of this code and both may be reported when both are documented.

  Full comparison: Z77.22 vs P96.81 →

• P04— 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 newborn affected by noxious substances transmitted via placenta or breast milk adds P04; it is not part of this code and both may be reported when both are documented.

  Full comparison: Z77.22 vs P04 →

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.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

1. 1 Code Also note — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
2. 2 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
3. 8 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

• Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.

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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Z77.22 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 18 Excludes1 notes across 2 chapters: T51 — Toxic effect of alcohol (via Z77.-), T51-T65 — Toxic effects of substances chiefly nonmedicinal as to source (T51-T65) (via Z77.-), T52 — Toxic effect of organic solvents (via Z77.-), T53 — Toxic effect of halogen derivatives of aliphatic and aromatic hydrocarbons (via Z77.-), T54 — Toxic effect of corrosive substances (via Z77.-), T55 — Toxic effect of soaps and detergents (via Z77.-), T56 — Toxic effect of metals (via Z77.-), T57 — Toxic effect of other inorganic substances (via Z77.-), T58 — Toxic effect of carbon monoxide (via Z77.-), T59 — Toxic effect of other gases, fumes and vapors (via Z77.-), T60 — Toxic effect of pesticides (via Z77.-), T61 — Toxic effect of noxious substances eaten as seafood (via Z77.-), T62 — Toxic effect of other noxious substances eaten as food (via Z77.-), T63 — Toxic effect of contact with venomous animals and plants (via Z77.-), T64 — Toxic effect of aflatoxin and other mycotoxin food contaminants (via Z77.-), T65 — Toxic effect of other and unspecified substances (via Z77.-), Z03 — Encounter for medical observation for suspected diseases and conditions ruled out (via Z77.-), Z13.88 — Encounter for screening for disorder due to exposure to contaminants (via Z77.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 4 Excludes2 notes across 2 chapters: P04 — Newborn affected by noxious substances transmitted via placenta or breast milk (via Z77.-), P96.81 — Exposure to (parental) (environmental) tobacco smoke in the perinatal period, Z57.31 — Occupational exposure to environmental tobacco smoke, Z91 — Personal risk factors, not elsewhere classified (via Z77.-).

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

Referenced by 55 Use Additional Code instructions across 8 chapters: C07 — Malignant neoplasm of parotid gland, C08 — Malignant neoplasm of other and unspecified major salivary glands, C09 — Malignant neoplasm of tonsil, C10 — Malignant neoplasm of oropharynx, C11 — Malignant neoplasm of nasopharynx, C12 — Malignant neoplasm of pyriform sinus, C13 — Malignant neoplasm of hypopharynx, C14 — Malignant neoplasm of other and ill-defined sites in the lip, oral cavity and pharynx, C32 — Malignant neoplasm of larynx, C33 — Malignant neoplasm of trachea, C34 — Malignant neoplasm of bronchus and lung, C39 — Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs, D00.0 — Carcinoma in situ of lip, oral cavity and pharynx, D02 — Carcinoma in situ of middle ear and respiratory system, G31.84 — Mild cognitive impairment of uncertain or unknown etiology, H65 — Nonsuppurative otitis media, H66 — Suppurative and unspecified otitis media, I10 — Essential (primary) hypertension, I10-I1A — Hypertensive diseases (I10-I1A), I11 — Hypertensive heart disease, +35 more.

These codes instruct coders to additionally report this code when it applies.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 1 MS-DRG: DRG 951 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):FAC025 — Other specified status (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Principal diagnosis restriction (Medicare Code Editor)

Not acceptable as a principal diagnosis on an inpatient claim.

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified status).

Z77.110 — Contact with and (suspected) exposure to air pollution, Z77.111 — Contact with and (suspected) exposure to water pollution, Z77.112 — Contact with and (suspected) exposure to soil pollution, Z77.118 — Contact with and (suspected) exposure to other environmental pollution, Z77.120 — Contact with and (suspected) exposure to mold (toxic), Z77.121 — Contact with and (suspected) exposure to harmful algae and algae toxins, Z77.122 — Contact with and (suspected) exposure to noise, Z77.123 — Contact with and (suspected) exposure to radon and other naturally occurring radiation, Z77.128 — Contact with and (suspected) exposure to other hazards in the physical environment, Z77.21 — Contact with and (suspected) exposure to potentially hazardous body fluids, Z77.29 — Contact with and (suspected) exposure to other hazardous substances, Z77.31 — Contact with and (suspected) exposure to Gulf War theater, Z77.39 — Contact with and (suspected) exposure to other war theater, Z77.9 — Other contact with and (suspected) exposures hazardous to health, Z78.0 — Asymptomatic menopausal state, Z78.1 — Physical restraint status, Z78.9 — Other specified health status, Z79.01 — Long term (current) use of anticoagulants, Z79.02 — Long term (current) use of antithrombotics/antiplatelets, Z79.1 — Long term (current) use of non-steroidal anti-inflammatories (NSAID), +232 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Exposure”; these codes share that main term but sit in a different category of the Tabular List.

Z20.821 — Contact with and (suspected) exposure to Zika virus (Zika virus), Z20.822 — Contact with and (suspected) exposure to COVID-19 (COVID-19), Z20.828 — Contact with and (suspected) exposure to other viral communicable diseases (viral disease NEC), Z20.89 — Contact with and (suspected) exposure to other communicable diseases (smallpox), Z20.9 — Contact with and (suspected) exposure to unspecified communicable disease (communicable disease), Z57.0 — Occupational exposure to noise (occupational, noise), Z57.1 — Occupational exposure to radiation (occupational, radiation), Z57.2 — Occupational exposure to dust (occupational, dust), Z57.31 — Occupational exposure to environmental tobacco smoke (occupational, environmental tobacco smoke), Z57.39 — Occupational exposure to other air contaminants (occupational, air contaminants NEC), Z57.4 — Occupational exposure to toxic agents in agriculture (occupational, toxic agentsin agriculture), Z57.5 — Occupational exposure to toxic agents in other industries (occupational, toxic agentsin industry NEC), Z57.6 — Occupational exposure to extreme temperature (occupational, extreme temperature), Z57.7 — Occupational exposure to vibration (occupational, vibration), Z57.8 — Occupational exposure to other risk factors (occupational, risk factors, specified NEC), Z57.9 — Occupational exposure to unspecified risk factor (occupational, risk factors), Z60.5 — Target of (perceived) adverse discrimination and persecution (persecution), Z65.4 — Victim of crime and terrorism (torture), Z65.5 — Exposure to disaster, war and other hostilities (war), Z91.B — Personal risk factor of exposure to diethylstilbestrol (risk factor, personal, to diethylstilbestrol), +18 more

Contextual Map

Every relationship of Z77.22 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 Z77.22 with these 22 related codes in Claim Check

Hierarchy

• Z00-Z99 — Chapter 21: Factors Influencing Health Status and Contact with Health Services (Z00-Z99) (Z00-Z99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77-Z99 — Persons with potential health hazards related to family and personal history and certain conditions influencing health status[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Excludes1

• F17 — Nicotine dependence[Excludes1]: “nicotine dependence (F17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• Z72.0 — Tobacco use[Excludes1]: “tobacco use (Z72.0)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Excludes2

• Z57.31 — Occupational exposure to environmental tobacco smoke[Excludes2]: “occupational exposure to environmental tobacco smoke (Z57.31)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes1 notes (18)

• T51 — Toxic effect of alcohol[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T51-T65 — Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T52 — Toxic effect of organic solvents[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T53 — Toxic effect of halogen derivatives of aliphatic and aromatic hydrocarbons[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T54 — Toxic effect of corrosive substances[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T55 — Toxic effect of soaps and detergents[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T56 — Toxic effect of metals[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T57 — Toxic effect of other inorganic substances[Excludes1](via Z77.-): “contact with and (suspected) exposure to toxic substances (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 10 more

Referenced by Excludes2 notes

• P04 — Newborn affected by noxious substances transmitted via placenta or breast milk[Excludes2](via Z77.-): “newborn in contact with and (suspected) exposures hazardous to health not transmitted via placenta or breast milk (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• P96.81 — Exposure to (parental) (environmental) tobacco smoke in the perinatal period[Excludes2]: “exposure to environmental tobacco smoke after the perinatal period (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• Z57.31 — Occupational exposure to environmental tobacco smoke[Excludes2]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• Z91 — Personal risk factors, not elsewhere classified[Excludes2](via Z77.-): “contact with and (suspected) exposures hazardous to health (Z77.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions (55)

• C07 — Malignant neoplasm of parotid gland[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C08 — Malignant neoplasm of other and unspecified major salivary glands[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C09 — Malignant neoplasm of tonsil[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C10 — Malignant neoplasm of oropharynx[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C11 — Malignant neoplasm of nasopharynx[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C12 — Malignant neoplasm of pyriform sinus[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C13 — Malignant neoplasm of hypopharynx[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• C14 — Malignant neoplasm of other and ill-defined sites in the lip, oral cavity and pharynx[Use Additional Code]: “exposure to environmental tobacco smoke (Z77.22)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 47 more

Clinical classification (CCSR)

• FAC025 — Other specified status[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS[MS-DRG]: “OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services[MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1,235 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

External cause index

• Exposure (to), smoke, tobacco, second hand[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2026

Index entries

• Exposure (to), environmental tobacco smoke (acute) (chronic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Exposure (to), second hand tobacco smoke (acute) (chronic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Passive, smoking[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Second hand tobacco smoke exposure (acute) (chronic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Smoking, passive[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• Z77 — Other contact with and (suspected) exposures hazardous to health[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.0 — Contact with and (suspected) exposure to hazardous, chiefly nonmedicinal, chemicals[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.01 — Contact with and (suspected) exposure to hazardous metals[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.010 — Contact with and (suspected) exposure to arsenic[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.011 — Contact with and (suspected) exposure to lead[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.012 — Contact with and (suspected) exposure to uranium[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.013 — Contact with and (suspected) exposure to gadolinium[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• Z77.018 — Contact with and (suspected) exposure to other hazardous metals[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

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

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Coding guidelines Official source data

ICD-10-CM Official Guidelines for Coding and Reporting (FY2026), quoted by section Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z77.22 in its code family, with their registry titles.

• Z77.122 — Contact with and (suspected) exposure to noise
• Z77.123 — Contact with and (suspected) exposure to radon and other naturally occurring radiation
• Z77.128 — Contact with and (suspected) exposure to other hazards in the physical environment
• Z77.2 — Contact with and (suspected) exposure to other hazardous substances
• Z77.21 — Contact with and (suspected) exposure to potentially hazardous body fluids
• Z77.29 — Contact with and (suspected) exposure to other hazardous substances
• Z77.3 — Contact with and (suspected) exposure to war theater
• Z77.31 — Contact with and (suspected) exposure to Gulf War theater
• Z77.32 — Contact with and (suspected) exposure to burn pits in war theater
• Z77.33 — Contact with and (suspected) exposure to Agent Orange

View all codes in the Z77 family