ICD-10 Code for Stress
The ICD-10-CM code for stress is F43.9 — Reaction to severe stress, unspecified. This is the code the Alphabetic Index gives for stress with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
F43.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which stress code should you use?
The Alphabetic Index lists 8 codes under Stress. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| fetal | P84 | Other problems with newborn | |
| mental NEC | Z73.3 | Stress, not elsewhere classified | |
| physical NEC | Z73.3 | Stress, not elsewhere classified | |
| polycythemia | D75.1 | Secondary polycythemia | |
| reaction | F43.9 | Reaction to severe stress, unspecified | |
| workplace | Z56.6 | Other physical and mental strain related to work | |
| work schedule | Z56.3 | Stressful work schedule |
Stress fetal
Stress mental NEC
| work-related | Z56.6 | Other physical and mental strain related to work |
Stress physical NEC
| work-related | Z56.6 | Other physical and mental strain related to work |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources