{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T23:14:24Z","timestamp":1774480464868,"version":"3.50.1"},"reference-count":13,"publisher":"S. Karger AG","issue":"6","license":[{"start":{"date-parts":[[2023,1,1]],"date-time":"2023-01-01T00:00:00Z","timestamp":1672531200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2023,1,1]],"date-time":"2023-01-01T00:00:00Z","timestamp":1672531200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Dermatology"],"published-print":{"date-parts":[[2023]]},"abstract":"<jats:p>Background: Case identification strategies to conduct population-based studies have not been developed for lichen planus (LP) or lichen planopilaris (LPP). Objectives: The aim of this study was to assess the validity of using diagnostic codes to establish both a cutaneous (non-oral) LP cohort and an LPP cohort from a large clinical database. Methods: A retrospective chart review was performed to determine whether patients with ICD-9 or ICD-10 codes for LP and ICD-10 codes for LPP are confirmed cases of LP and LPP. Validation samples were used to estimate the positive predictive value (PPV) of three case definitions any LP, non-oral LP, and LPP defined as: at least one code by any physician, at least two codes by any physician, and at least one code by a dermatologist. Results: Among the 199 reviewed LP charts, 166 and 123 were confirmed cases of any LP and non-oral LP, respectively. The PPVs for any LP were: 83.4% (166\/199) for one code by any physician, 84.6% (77\/91) for two codes by any physician, and 95.1% (97\/102) for one code by a dermatologist. The PPVs for non-oral LP were: 61.8% (123\/199) for one code by any physician, 70.3% (64\/91) for two diagnoses by any physician, and 86.3% (88\/102) for one diagnosis by a dermatologist. Of the 139 patients with at least one code for LPP, 122 were confirmed cases of LPP. The case definition for one LPP code applied by any physician had a PPV of 87.8% (122\/139) to identify a true case of LPP, whereas two diagnoses by any physician had a PPV of 96.2% (76\/79) and a diagnosis by a dermatologist had a PPV of 93% (107\/115). Conclusions: Diagnosis codes for LP and LPP, restricted by the diagnosing physician\u2019s specialty, may be used to accurately identify case cohorts of overall LP, non-oral LP, or LPP in large clinical databases. <\/jats:p>","DOI":"10.1159\/000533247","type":"journal-article","created":{"date-parts":[[2023,10,11]],"date-time":"2023-10-11T21:03:05Z","timestamp":1697058185000},"page":"906-911","source":"Crossref","is-referenced-by-count":6,"title":["Validity of Lichen Planus and Lichen Planopilaris Case Identification Using Diagnostic Codes from a Clinical Database"],"prefix":"10.1159","volume":"239","author":[{"given":"Natalia","family":"Pelet del Toro","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrew","family":"Strunk","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amit","family":"Garg","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"George","family":"Han","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2023,7,26]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jad.2021.12.127"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1097\/DSS.0000000000000565"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.3390\/cancers13225740"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijwd.2020.09.005"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1111\/bjd.13259"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1016\/j.jds.2018.07.002"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaad.2021.12.013"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.5070\/D327854687"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1111\/ddg.12264"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaad.2020.10.081"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1002\/pst.1901"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.4103\/ijt.ijt_67_20"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.1159\/000468148"}],"container-title":["Dermatology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/drm\/article-pdf\/239\/6\/906\/4054205\/000533247.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/karger.com\/drm\/article-pdf\/239\/6\/906\/4054205\/000533247.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,23]],"date-time":"2025-04-23T15:34:15Z","timestamp":1745422455000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000533247"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023]]},"references-count":13,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2023,12,5]]},"published-print":{"date-parts":[[2023,12,5]]}},"URL":"https:\/\/doi.org\/10.1159\/000533247","archive":["Portico"],"relation":{},"ISSN":["1018-8665","1421-9832"],"issn-type":[{"value":"1018-8665","type":"print"},{"value":"1421-9832","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023]]}}}