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Table 2 Number (% changea) of outpatient visits (×1000) of four diabetes-related coding practices in outpatient claims by the same physician in tertiary medical centers (intervention group) and clinics (control group) from 2016Q1 to 2017Q3 in Taiwan (ICD-10-CM code E119 is the Outpatient Volume Control Program (OVCP) monitoring code and E110-E118 are non-OVCP monitoring codes)

From: Physician code creep after the initiation of outpatient volume control program and implications for appropriate ICD-10-CM coding

 2016Q12016Q22016Q32016Q42017Q12017Q22017Q395% CI of 2017Q3
Coding practice 1: E119 in primary diagnosis
 Medical centers270(0%)281(+ 4%)270(0%)252(−7%)186(−31%)94(−65%)72(−73%)− 72.8% to − 74.0%
 Clinics575(0%)609(+ 6%)610(+ 6%)566(−2%)511(−11%)492(−15%)475(−17%)−17.4% to − 17.5%
Coding practice 2: E119 in secondary diagnosis
 Medical centers304(0%)318(+ 5%)305(0%)287(−5%)273(−10%)258(−15%)242(−20%)−20.3% to − 20.5%
 Clinics259(0%)275(+ 6%)272(+ 5%)250(−3%)219(−15%)208(−20%)198(−24%)− 23.5% to − 23.8%
Coding practice 3: E110 − E118 in primary diagnosis
 Medical centers198(0%)222(+ 13%)219(+ 11%)208(+ 5%)234(+ 18%)285(+ 44%)289(+ 46%)46.0 to 46.6%
 Clinics139(0%)154(+ 11%)157(+ 13%)153(+ 10%)138(−1%)137(−2%)136(−2%)−2.2% to − 2.2%
Coding practice 4: E110 − E118 in secondary diagnosis
 Medical centers112(0%)122(+ 8%)119(+ 6%)111(−1%)99(−11%)103(−8%)105(−6%)−5.8% to −5.9%
 Clinics41(0%)45(+ 11%)47(+ 14%)43(+ 6%)37(−8%)37(−9%)36(−12%)−11.5% to − 11.8%
  1. Abbreviations: ICD − 10 – CM International Classification of Disease Tenth Revision Clinical Modification, E119 Type 2 diabetes mellitus without complications, E111 − E118 Type 2 diabetes mellitus with ketoacidosis, kidney, ophthalmic, neurological, circulatory, and other specific and unspecific complications, 95% CI 95% confidence intervals
  2. aUsing the number of visits of 2016Q1 as the base for % change
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