Medical Coding — Home Health

ICD-10, OASIS, PDGM — Home Health specialization

Category: Medical

Learning Path: What → Why → Architecture → Setup → Real Examples → Production → Interview Prep

What is Medical Coding — Home Health?

Revenue cycle is the complete financial process — patient referral, eligibility verification, coding, billing, and payment. Every coding error impacts reimbursement. Clean coding = clean claims = faster payment.

Why Medical Coding — Home Health?

ICD-10-CM has ~72,000 codes. Always verify in the Tabular List after finding in the Alphabetic Index — the Index can mislead. NEC (Not Elsewhere Classified) = coder knows more detail but no specific code. NOS (Not Otherwise Specified) = provider did not specify.

Learning Modules

Module 01 — Revenue Cycle Fundamentals

From referral to reimbursement

Topics covered:

•Home Health Revenue Cycle overview — 🟢 Beginner

•Referral → SOC → Billing flow — 🟢 Beginner

•Payer mix and authorization — 🟡 Intermediate

Module 02 — ICD-10 Fundamentals

Coding structure and guidelines

Topics covered:

•ICD-10-CM structure (A00-Z99) — 🟢 Beginner

•Alphabetic Index navigation — 🟢 Beginner

•Tabular List and verification — 🟡 Intermediate

•NEC vs NOS — 🟡 Intermediate

•WITH Rule — 🟡 Intermediate

Module 03 — Coding Rules

Etiology/Manifestation, Sequencing

Etiology/Manifestation: code the underlying disease (E11.xx) first, then the manifestation (diabetes with neuropathy = E11.40 + G63). Code first means the condition in brackets is always sequenced first. Excludes1 means never code together. Excludes2 means can code together if patient actually has both.

Topics covered:

•Etiology/Manifestation convention — 🟡 Intermediate

•Principal vs additional diagnoses — 🟡 Intermediate

•Code first, Use additional code — 🟡 Intermediate

•Excludes1 vs Excludes2 — 🔴 Advanced

Module 04 — OASIS & PDGM

Assessment, grouping, payment

PDGM replaced PPS in 2020. Payment is in 30-day periods (not 60). Each period has a clinical grouping based on primary diagnosis. Comorbidity adjustment adds to base payment. LUPA occurs when visits fall below threshold — significant payment reduction.

Topics covered:

•OASIS data elements overview — 🟡 Intermediate

•PDGM 30-day payment periods — 🟡 Intermediate

•Clinical groupings and comorbidities — 🔴 Advanced

•LUPA (Low Utilization Payment Adjustment) — 🔴 Advanced

•SOC, ROC, REC, SCIC assessments — 🟡 Intermediate

Module 05 — Coding Domains

Diabetes, Wound, Cardiac, Respiratory

Each domain has specific guidelines. Diabetes: always code to the highest degree of specificity (E11.621 = T2DM with foot ulcer). Wound care: stage and laterality matter. Sepsis: code the infection first, then sepsis. Z codes capture functional status and care needs critical for home health.

Topics covered:

•Diabetes mellitus coding — 🟡 Intermediate

•Wound care and pressure injuries — 🟡 Intermediate

•CHF and cardiac conditions — 🔴 Advanced

•COPD and respiratory — 🔴 Advanced

•Z codes for home health — 🟡 Intermediate

•Sepsis coding — 🔴 Advanced

Production Example

Interview Prep

!!! tip "PSR Formula"

Answer every question: Problem → Solution → Result. 45-90 seconds max.