ICD-9-CM Volume 2 Index entries containing back-references to 
254.8:
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) 493.9

Kopp's 254.8
thymic 254.8
 - Atrophy, atrophic
fatty, thymus (gland) 254.8
thymus (fat) 254.8
 - Convulsions (idiopathic) 780.39

thymic 254.8
 - Cyst (mucus) (retention) (serous) (simple)
thymus (gland) 254.8
 - Degeneration, degenerative
thymus (gland) 254.8
 - Disease, diseased - see also Syndrome
thymus (gland) 254.9

specified NEC 254.8
 - Emphysema (atrophic) (centriacinar) (centrilobular) (chronic) (diffuse) (essential) (hypertrophic) (interlobular) (lung) (obstructive) (panlobular) (paracicatricial) (paracinar) (postural) (pulmonary) (senile) (subpleural) (traction) (unilateral) (unilobular) (vesicular) 492.8

thymus (gland) (congenital) 254.8
 - Failure, failed
involution, thymus (gland) 254.8
 - Fibrosis, fibrotic
thymus (gland) 254.8
 - Hemorrhage, hemorrhagic (nontraumatic) 459.0

thymus (gland) 254.8
 - Hyperthymism 254.8
 - Infiltrate, infiltration
thymus (gland) (fatty) 254.8
 - Inflammation, inflamed, inflammatory (with exudation)
thymus (gland) 254.8
 - Involution, involutional - see also condition
thymus failure 254.8
 - Kopp's asthma 254.8
 - Lymphatism 254.8
scrofulous (see also Tuberculosis) 017.2
 - Necrosis, necrotic
thymus (gland) 254.8
 - Persistence, persistent (congenital) 759.89

thymus (gland) 254.8
 - Status (post)
lymphaticus 254.8
thymicolymphaticus 254.8
thymicus 254.8
thymolymphaticus 254.8
 - Thymitis 254.8