Chapter 33 — Further Reading

The orientation for this chapter's sources: nearly everything that governs inpatient payment is free, federal, and revised annually. The single most important habit this list can teach is to read the current year's IPPS final rule tables rather than anyone's summary of last year's — including this book's constructed figures, which exist to teach structure and expire on principle.

Tier 1 — Canonical: the rules themselves

• The annual IPPS final rule (Federal Register; CMS's IPPS regulations homepage). The living authority for everything §33.5 taught: the standardized amounts and labor shares, wage indexes, every relative weight, the GMLOS/AMLOS tables, the outlier fixed-loss threshold, the transfer DRG list, and the CC/MCC list changes. The tables (weights and means per MS-DRG; the CC/MCC designations) are downloadable and are the working coder's actual reference.
• The MS-DRG Definitions Manual (CMS, free). The grouper's logic in document form: every MDC, every DRG's inclusion logic, the OR-procedure designations, the CC/MCC exclusion logic §33.3 gestured at. When a DRG assignment surprises you, the answer is in here.
• ICD-10-CM Official Guidelines for Coding and Reporting — Sections II and III, and Appendix I (CMS/NCHS, free, annual). Section II is §33.2's rulebook (principal diagnosis selection, the circumstance-by-circumstance rules); Section III governs additional diagnoses; Appendix I is the complete POA reporting guidance, including the exempt list.
• ICD-10-PCS: the code set, the Official Guidelines, and the Reference Manual (CMS, free, updated every October 1). The Reference Manual's root-operation definitions and examples are the best structural introduction in print, and they are the primary source behind §33.9.
• Medicare Claims Processing Manual, CMS Publication 100-04, Chapter 3 — Inpatient Hospital Billing. The operational text: the post-acute care transfer policy's mechanics, discharge status requirements, interim billing, and the claim-level implementation of everything this chapter taught as arithmetic.
• Social Security Amendments of 1983, Public Law 98-21 — the statute that created IPPS — and 42 CFR Part 412, the regulation that implements it (the transfer rule, outliers, and the HAC payment provision all live here).
• Deficit Reduction Act of 2005, §5001(c) — the statutory basis of POA reporting and the HAC payment provision (§33.7), with CMS's HAC and POA program pages as the current-state reference.
• The UHDDS definitions — the federal definitional basis for principal diagnosis and reportable secondary diagnoses on inpatient claims, as carried into the Guidelines.

Tier 2 — Attributed: context, evaluation, and the honest numbers

• Simborg, D., "DRG creep: a new hospital-acquired disease," New England Journal of Medicine (1981). Two pages, written before national implementation, still the clearest statement of Case Study 2's problem. Worth reading in full.
• The Yale DRG development literature (Fetter, Thompson, and colleagues) — the original answer to "what is a hospital's product?", and the intellectual foundation of Case Study 1.
• The RAND Corporation's PPS evaluation studies (late 1980s–1990, various journals) — the documented basis for "quality broadly held, discharges got riskier." Read for method as much as finding: this is what evaluating a payment change honestly looks like.
• MedPAC's annual Report to the Congress: Medicare Payment Policy — the hospital chapters are the best recurring plain-language analysis of IPPS adequacy, case-mix change, and documentation-and-coding effects, including the post-2008 MS-DRG experience.
• OIG reports and Work Plan items on hospital billing: severity capture and high-value MCC patterns, POA accuracy, and post-acute transfer coding — the documented audit landscape behind §33.7, §33.8, and Case Study 2. Search the OIG site for current inpatient items; the subjects recur.
• AHIMA and ACDIS practice resources on clinical documentation integrity and compliant query practice — the professional literature bridging this chapter's payment consequence to Chapter 38's query mechanics. Benchmarks and survey figures in this literature are Tier 2: ranges, not facts.

Tier 3 — Illustrative and constructed: this book's own apparatus

• Account 22-8891 — Ridgeview Regional Medical Center's four-day COPD admission: every diagnosis, weight, base-rate component, GMLOS, and dollar figure in the chapter's worked examples is a constructed teaching figure, labeled where it appears, and reconciled to the cent within the book.
• The counterfactual documents — Figure 33.3's "version B" H&P sentence, the §33.8 transfer scenario, and the Encounter's hip-fracture admission for Account 10-4471's patient — constructed lenses; none alters the canonical files.
• 0DTJ4ZZ — the classic laparoscopic appendectomy teaching example used structurally in §33.9; like every code in this book, to be verified in the current year's tables before any use on a real claim.