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ICD-10-CM 2027 diagnosis code

T67.01XAHeatstroke and sunstroke, initial encounter

✓ Billable / specificRequires 7th characterCC — complication/comorbidity

T67.01XA is a valid, billable ICD-10-CM code for heatstroke and sunstroke, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2020 (effective October 1, 2019). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T67.01XA

T67.01XA is the ICD-10-CM diagnosis code for heatstroke and sunstroke, initial encounter. It belongs to category T67 (effects of heat and light), block T66-T78 (other and unspecified effects of external causes) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC, relative weight 1.6238) and DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC, relative weight 0.9973), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), 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 was added in FY2020, effective October 1, 2019.

7th character

Ainitial encounter

CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.

Other encounter types for T67.01:

Notes that apply from higher levels

Instructions written at a parent level also apply to T67.01XA.

› From T67.0 Heatstroke and sunstroke
Use additional code
  • code(s) to identify any associated complications of heatstroke, such as:
  • coma and stupor (R40.-)
  • rhabdomyolysis (M62.82)
  • systemic inflammatory response syndrome (R65.1-)
› From T67 Effects of heat and light
Excludes1
  • erythema [dermatitis] ab igne (L59.0)
  • malignant hyperpyrexia due to anesthesia (T88.3)
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
Excludes2

Broader instructions also apply from T66-T78 Other and unspecified effects of external causes and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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.

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
  • FY2020 (effective 10/1/2019): Added
  • No changes since FY2020.

Common questions about T67.01XA

Is T67.01XA billable?

Yes. T67.01XA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of T67.01XA mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can T67.01XA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T67.01XA as a principal diagnosis.

Is T67.01XA a CC or MCC?

T67.01XA is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does T67.01XA group to?

T67.01XA is used in the MS-DRG v44.0 logic for MS-DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC) and MS-DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.