Inpatient Diagnosis Coding Rules at a Glance (ICD-10-CM Cheat Sheet)

A two-page quick reference for hospital inpatient ICD-10-CM diagnosis coding. A step-by-step flow walks you to the principal diagnosis, and every rule carries its Official Guidelines section number so you can look it up fast.

WHAT'S INSIDE

• Page 1: the UHDDS principal diagnosis definition and a decision flow for admissions from observation or outpatient surgery, rehabilitation, complications of care, uncertain diagnoses (and how the outpatient rule differs), interrelated and either/or diagnoses, symptoms, and treatment not carried out, each tagged II.A to II.K
• Page 2: the Section III "other diagnoses" criteria, previous conditions, abnormal findings, and uncertain diagnoses, the POA indicators (Y, N, U, W, and exempt), the POA rules coders often miss, and 5 worked examples with POA

FILE FORMAT

• One PDF, US Letter (8.5 x 11 inches), 2 pages. Print it or keep it open on your screen.

HOW IT WORKS

Your download link appears right after payment and is emailed to you.

GOOD TO KNOW

• Based on the FY2027 ICD-10-CM code set and Official Guidelines (in effect October 1, 2026 to September 30, 2027). Codes change every October, so check the current year.
• This guide covers ICD-10-CM diagnosis coding only. It has no CPT procedure codes.
• Educational reference, not legal or billing advice. Payers and facilities can add their own rules.
• This is a study aid and work reference, not for use in exam code books. Check your own exam's rules (AAPC or AHIMA CCS) before taking anything into an exam.
• Not affiliated with or endorsed by CMS, NCHS, AHA, AAPC, or AHIMA.
• Digital items generally can't be returned. If a file is missing, damaged, or different from this listing, email thedenialdesk@gmail.com and I'll help sort it out.
• Drafted with help from AI tools, then reviewed and fact-checked by a certified medical coding professional.

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