T70.29XA — Other effects of high altitude, initial encounter
Is T70.29XA billable?
Yes — T70.29XA is billable for FY2027. T70.29XA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T70.29XA may be submitted for encounters from October 1, 2026 through September 30, 2027.
T70.29XA at a glance
| Code | T70.29XA |
|---|---|
| Description | Other effects of high altitude, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T70.29XA?
In T70.29XA, the 7th character A means initial encounter. The 7th character is required for T70.29XA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T70.29XA group to?
T70.29XA sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 922Other Injury, Poisoning and Toxic Effect Diagnoses with MCCmedical
- 923Other Injury, Poisoning and Toxic Effect Diagnoses without MCCmedical
How is T70.29XA listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T70.29, the nearest indexed parent of T70.29XA. Use them to find the family, then select the specific code.
- Acosta's disease
- Aerodontalgia
- Alpine sickness
- Andes disease
- Barodontalgia
- Barotrauma
- Hypobarism
- Hypobaropathy
Inclusion terms
Alternative wording in documentation that is classified to T70.29XA.
- Alpine sickness
- Anoxia due to high altitude
- Barotrauma NOS
- Hypobaropathy
- Mountain sickness
Use additional code — inherited from Chapter 19
Report an additional code alongside T70.29XA to fully describe the condition. T70.29XA is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T70.29XA, but a patient may have both at the same time. When documentation supports it, T70.29XA and the excluded code may both be reported.
Excludes2 — not included here — inherited from T70.2
The conditions below are not part of T70.29XA, but a patient may have both at the same time. When documentation supports it, T70.29XA and the excluded code may both be reported.
- polycythemia due to high altitude (D75.1)
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T70.29XA is sequenced first depends on the reason for the encounter.
- , if applicable, place of occurrence, such as:
- highway rest stop (Y92.523)
- school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
- service areas as the place of occurrence of the external cause (Y92.52-)
- single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
- transport vehicle as the place of occurrence of the external cause (Y92.81-)
How long has T70.29XA existed?
T70.29XA has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.