Table 2.

Summary by final diagnosis for all persons billed with the ICD-9-CM code of 287.3 as an OUMC outpatient, 1995–2004

Evidence level children	N	%
Definite (by a hematologist)	220	68.0
Definite (by a non-hematologist)	5	1.5
Probable ITP	10	3.0
Unlikely ITP	0	0.0
Not ITP, correct code,	11	3.5
Not ITP, incorrect code	77	24.0
Total records	323	100.0
Evidence level adults	N	%
Definite (by a hematologist)	120	53.3
Definite (by a non-hematologist)	11	5.0
Probable ITP	10	4.4
Unlikely ITP	4	1.8
Not ITP, correct code,	3	1.3
Not ITP, incorrect code	77	34.2
Total records	225	100.0