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ICD-10-CM 2027 diagnosis code

Z77.42Contact with and (suspected) exposure to high-level blast overpressure

✓ Billable / specificNew for 2027POA exemptNot a principal dx

Z77.42 is a valid, billable ICD-10-CM code for contact with and (suspected) exposure to high-level blast overpressure. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Contact with and exposure to high-level blast overpressure

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About Z77.42

Z77.42 is the ICD-10-CM diagnosis code for contact with and (suspected) exposure to high-level blast overpressure. It belongs to category Z77 (other contact with and (suspected) exposures hazardous to health), block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z77.4 (contact with and (suspected) exposure to blast overpressure), Z77.42 is specifically for contact with and (suspected) exposure to high-level blast overpressure. Related codes cover unspecified blast overpressure (Z77.40), low-level blast overpressure (Z77.41) and other blast overpressure (Z77.49).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2027, effective October 1, 2026.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Contact with and (suspected) exposure to HLB overpressure

Notes that apply from higher levels

Instructions written at a parent level also apply to Z77.42.

› From Z77 Other contact with and (suspected) exposures hazardous to health
Includes
  • contact with and (suspected) exposures to potential hazards to health
Excludes2
  • contact with and (suspected) exposure to communicable diseases (Z20.-)
  • exposure to (parental) (environmental) tobacco smoke in the perinatal period (P96.81)
  • newborn affected by noxious substances transmitted via placenta or breast milk (P04.-)
  • occupational exposure to risk factors (Z57.-)
  • retained foreign body (Z18.-)
  • retained foreign body fully removed (Z87.821)
  • toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Broader instructions also apply from Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status and Chapter 21: Factors influencing health status and contact with health services.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Z77.42.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2027 (effective 10/1/2026): Added

Common questions about Z77.42

Is Z77.42 billable?

Yes. Z77.42 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Z77.42 be used as a principal diagnosis?

No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

Is Z77.42 a CC or MCC?

No. Z77.42 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Z77.42 group to?

Z77.42 is used in the MS-DRG v44.0 logic for MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

Did Z77.42 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.