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References: Healthcare Economics and Medical Coding Systems

  1. ICD-10 - Wikipedia - Explains the WHO's ICD-10 classification and its expansion into the 70,000-code U.S. ICD-10-CM Clinical Modification, including the category-plus-decimal-specifier structure this chapter decodes for E11.9, I10, and I21.3.

  2. Current Procedural Terminology - Wikipedia - Describes the AMA-maintained CPT code set's six Category I sections, annual October update cycle, and licensing model, supporting this chapter's CPT 99213 office-visit billing and RVU productivity examples.

  3. Health care in the United States - Wikipedia - Documents U.S. per-capita and GDP-share healthcare spending, the employer/Medicare/Medicaid payer mix, and integrated delivery systems, grounding this chapter's cost-comparison and payer-provider-patient stakeholder sections.

  4. Health Economics: Fundamentals and Flow of Funds (4th Edition) - Thomas E. Getzen - John Wiley & Sons - Getzen originated the "flow of funds" diagram tracing money among patients, providers, payers, employers, and government, a framework widely adopted for teaching the payer-provider-patient triangle this chapter's premium and claims worked example illustrates.

  5. Buck's Step-by-Step Medical Coding (2023 Edition) - Carol J. Buck - Elsevier - Buck pioneered the "step-by-step" instructional method with distinctive two-tone highlighting for teaching how to look up and assign ICD, CPT, and HCPCS codes, the standard pedagogy behind AAPC- and AHIMA-aligned coding courses.

  6. ICD-10 | CMS - Centers for Medicare & Medicaid Services - Official page listing ICD-10-CM/PCS code files, coding guidelines, and the CDC's role in maintaining diagnosis codes, confirming this chapter's claim that ICD-10-CM updates on an annual schedule.

  7. Healthcare Common Procedure Coding System (HCPCS) | CMS - Centers for Medicare & Medicaid Services - Explains that HCPCS Level I is identical to CPT while Level II covers durable medical equipment, ambulance transport, and supplies, matching this chapter's E0601 CPAP-device example exactly.

  8. Electronic Health Records and Their Benefits - HealthIT.gov (Office of the National Coordinator for Health IT) - Defines the EHR as a longitudinal record spanning multiple care settings and stresses interoperability, reinforcing this chapter's description of the EHR as an integration point across lab, pharmacy, and ordering systems.

  9. National Drug Code Directory | FDA - U.S. Food and Drug Administration - The FDA's searchable, daily-updated directory of NDC drug identifiers, the authoritative source behind this chapter's labeler-product-package NDC example and its warning about inconsistent zero-padding across systems.

  10. How does health spending in the U.S. compare to other countries? - Peterson-KFF Health System Tracker - Interactive chart collection comparing U.S. per-person healthcare spending and GDP share against peer nations, the same OECD-style comparison this chapter's opening cost section and MicroSim chart present.