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ICD-10-CM 2027 diagnosis code

T70.29Other effects of high altitude

Not billable — use a more specific codeRequires 7th character

T70.29 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

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

About T70.29

T70.29 is the ICD-10-CM diagnosis code for other effects of high altitude. It belongs to category T70 (effects of air pressure and water pressure), block T66-T78 (other and unspecified effects of external causes) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T70.2, choose T70.29 (Other effects of high altitude) only when documentation doesn't support a more specific option: unspecified effects of high altitude (T70.20).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category T70

Coding notes

Applicable toConditions and synonyms classified to this code
  • Alpine sickness
  • Anoxia due to high altitude
  • Barotrauma NOS
  • Hypobaropathy
  • Mountain sickness

Notes that apply from higher levels

Instructions written at a parent level also apply to T70.29.

› From T70.2 Other and unspecified effects of high altitude
Excludes2
  • polycythemia due to high altitude (D75.1)

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.

Alphabetic index entries

27 entries

Terms in the official ICD-10-CM index that lead to T70.29.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T70.29

Is T70.29 billable?

No. T70.29 is a header code. Report one of its more specific subcodes instead.