ICD-10-CM Alphabetic Index · FY 2026 64 Entries
Observation in the ICD-10-CM Index ICD-10-CM
The main term Observation (following) (for) (without need for further medical care) carries 64 index entries pointing to 38 ICD-10-CM codes. The default entry is Z04.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
64
Index Entries
38
Codes Referenced
Z04.9
Default Code
O
Letter
64 of 64 shown
ICD-10-CM
Index Entries Under Observation 64 entries · 38 codes
Observation (following) (for) (without need for further medical care) Z04.9
accident NEC Z04.3
at work Z04.2
transport Z04.1
adverse effect of drug Z03.6
alleged rape or sexual assault (victim), ruled out
adult Z04.41
child Z04.42
criminal assault Z04.89
development state
adolescent Z00.3
period of rapid growth in childhood Z00.2
puberty Z00.3
disease, specified NEC Z03.89
following work accident Z04.2
forced sexual exploitation Z04.81
forced labor exploitation Z04.82
growth and development state see Observation, development state
injuries (accidental) NEC see also Observation, accident
newborn (for)
ruled out Z05.9
cardiac Z05.0
connective tissue Z05.73
gastrointestinal Z05.5
genetic Z05.41
genitourinary Z05.6
immunologic Z05.43
infectious Z05.1
metabolic Z05.42
musculoskeletal Z05.72
neurological Z05.2
respiratory Z05.3
skin and subcutaneous tissue Z05.71
specified condition NEC Z05.89
postpartum
immediately after delivery Z39.0
routine follow-up Z39.2
pregnancy (normal) (without complication) Z34.9- Non-billable
high risk O09.9- Non-billable
suicide attempt, alleged NEC Z03.89
self-poisoning Z03.6
suspected, ruled out see also Suspected condition, ruled out
abuse, physical
adult Z04.71
child Z04.72
accident at work Z04.2
adult battering victim Z04.71
child battering victim Z04.72
condition NEC Z03.89
newborn Z05.9 see also Observation, newborn (for), suspected condition, ruled out
drug poisoning or adverse effect Z03.6
exposure (to)
anthrax Z03.810
biological agent NEC Z03.818
inflicted injury NEC Z04.89
foreign body
aspirated (inhaled) Z03.822
ingested Z03.821
inserted (injected), in (eye) (orifice) (skin) Z03.823
suicide attempt, alleged Z03.89
self-poisoning Z03.6
toxic effects from ingested substance (drug) (poison) Z03.6
toxic effects from ingested substance (drug) (poison) Z03.6
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
