2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Oral Cavity, Salivary Glands, And Jaws 520-529 > Disorders Of Tooth Development And Eruption 520.* >  2008 ICD-9-CM Diagnosis 520.4
Disturbances of tooth formation- A form of AMELOGENESIS IMPERFECTA characterized by incomplete formation of the dental enamel and transmitted as an X-linked or autosomal dominant trait. It is also associated with vitamin A, C, or D deficiency, infectious disease, prematurity, birth injury, Rh incompatibility, trauma, or local infection. Small grooves, pits, and fissures are seen in mild cases, deep horizontal rows of pits in severe cases, or absence of enamel in extreme cases. (Dorland, 27th ed)
- A localized arrested tooth development which appears to involve most commonly the anterior teeth, usually on one side of the midline, most often the maxillary central and lateral incisors. Roentgenographically, the teeth have a ghostlike appearance. Calcification and bits of prismatic enamel may be found in the pulp and the enamel is thin and absent in part. (Jablonski, Illustrated Dictionary of Dentistry, 1982)
- A tooth's loss of minerals, such as calcium in hydroxyapatite from the tooth matrix, caused by acidic exposure. An example of the occurrence of demineralization is in the formation of dental caries.
- 520.4 is a specific code that can be used to specify a diagnosis
- 520.4 contains 16 index entries
- View the ICD-9-CM Volume 1 520.* hierarchy
520.4 also known as:- Aplasia and hypoplasia of cementum
- Dilaceration of tooth
- Enamel hypoplasia (neonatal) (postnatal) (prenatal)
- Horner's teeth
- Hypocalcification of teeth
- Regional odontodysplasia
- Turner's tooth
520.4 excludes: - Hutchinson's teeth and mulberry molars in congenital syphilis (090.5)
- mottled teeth (520.3)
Index entries containing 520.4:- Absence (organ or part) (complete or partial)
- cementum
 520.4
Amelogenesis imperfecta 520.5- nonhereditaria (segmentalis) 520.4
Aplasia - see also Agenesis- cementum 520.4
Calcification- dentinal papilla 520.4
Dilaceration, tooth 520.4
Disturbance - see also Disease- tooth
- formation 520.4
Ghost- teeth 520.4
Horner's- teeth 520.4
Hypocalcification, teeth 520.4
Hypoplasia, hypoplasis 759.89- cementum 520.4
- enamel of teeth (neonatal) (postnatal) (prenatal) 520.4
- Turner's (tooth) 520.4
Odontodysplasia, regional 520.4
Pitted - see also Pitting- teeth 520.4
Turner's- hypoplasia (tooth) 520.4
- tooth 520.4
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