Search any of these databases using the phrase "clinical documentation improvement" (including the quotation marks).  There may be some overlap, but each database does cover unique resources that can help you identify different disciplinary perspectives on this topic.

The Wikipedia entry on Clinical Documentation Improvement, also known as Clinical Documentation Integrity, provides helpful background information on the development of this practice area, but has not been updated for a few years.

• MS-DRG Classifications and Software - provided by the Centers for Medicare & Medicaid Services, US Dept of Health & Human Services.
• ICD-10-CM/PCS MS-DRG v39.0 Definitions Manual
  • MS-DRGs = Medicare Severity Diagnosis Related Groups

World Health Organization.  International Classification of Diseases (ICD).  version 11 released on 18 June 2018 prior to endorsement. Member States will start reporting using ICD-11 on 1 January 2022. 

The WHO International Classification of Health Interventions (ICHI) can also be viewed at the same website.  Additional WHO classifications are also available.

OECD Data for Measuring Health Care Quality and Outcomes

Association of Clinical Documentation Improvement Specialists

American Health Information Management Association (AHIMA)

• CDI Toolkit (2016 edition): available to AHIMA members only
• CDI: Gauging the Need, Starting off Right, by Genna Rollins