The OASIS-E2 Manual
Plain-English. CMS-cited. Written by a clinician for the home health team — admins, DONs, intake, QA, and clinicians who chart OASIS.
The manual
Pick a chapter
CMS-cited chapters covering the full OASIS-E2 process — from assessment timing to iQIES submission.
- Chapter 016 min read
OASIS Assessment Schedule (SOC, ROC, Recert, Discharge)
When each OASIS assessment is required, the CMS timepoints involved, and how the 60-day certification period anchors the whole schedule from admission to discharge.
Open chapter - Chapter 028 min read
RFA Codes (01–09)
The Reason for Assessment field — every OASIS assessment is one of nine RFA codes. (RFA 02 retired in OASIS-C 2010; RFA 10 does not exist.)
Open chapter - Chapter 035 min read
M0090, Completion Windows, and Transmission Deadlines
The dates that drive every OASIS — RFA-specific completion windows, the M0090 date, and the 30-day iQIES transmission clock, with the CMS citation for each.
Open chapter - Chapter 047 min read
OASIS Skip Patterns and Branching Logic
When to skip an OASIS item, when to score it, and how gateway-driven branching logic works across Sections C, GG, and the rest of OASIS-E2.
Open chapter - Chapter 057 min read
QA Workflow, Locking, and Corrections
How agencies QA an OASIS assessment before transmission, and the CMS rules for correcting or inactivating a record after iQIES has already accepted it.
Open chapter - Chapter 066 min read
Submitting OASIS to iQIES
How OASIS-E2 records get submitted to iQIES through HARP authentication, the validation errors that come back, and exactly what to do when CMS rejects a record.
Open chapter - Chapter 077 min read
OASIS Glossary
Common abbreviations, terms, and acronyms used throughout the OASIS-E2 spec — CMS-speak, billing-speak, and clinical-speak, defined in plain English.
Open chapter - Item ReferenceComing soon
Sections A–Q + GG
Domain-by-domain item guidance — every M-code and GG item with scoring rules, examples, and common errors.
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Free tools
Free tools for fast answers
Read the chapter, then run the numbers. OASIS deadlines, RFA selection, item lookup, and PDGM grouping — each one CMS-cited, on its own page.
- OASIS · Coding
OASIS RFA Picker
Answer a few clinical questions, get the right RFA code (01, 03–09) with M0090 rule and transmission deadline.
Open tool - OASIS · Scheduling
OASIS Schedule Calculator
Enter a Start of Care date — get the full cert period schedule with M0090, recert window, and transmission deadlines.
Open tool - OASIS · Reference
OASIS Item Lookup
Search by M-code or keyword. Response options, scoring rules, and common errors for every OASIS-E2 item.
Open tool - PDGM · Coding
PDGM HIPPS Decoder
Paste a 5-character HIPPS code and see what each character means — admission source, timing, clinical group, functional level, comorbidity adjustment.
Open tool - PDGM · Reference
PDGM Clinical Groups
All 12 PDGM clinical groups (A–L) with CMS labels, summaries, and ICD-10 chapter examples.
Open tool - PDGM · Functional
PDGM Functional Level
Score the eight CY2026 OASIS items (M1800–M1860, M1033) and get Low / Medium / High with the threshold band that applies.
Open tool - ICD-10 · Coding
PDGM Primary Dx Eligibility
Enter an ICD-10-CM code and see whether it's safe as a PDGM primary diagnosis or at risk of being returned to provider.
Open tool - ICD-10 · Reference
ICD-10-CM Chapter Reference
All 22 ICD-10-CM chapters (FY2026) with labels, RTP risk, and PDGM clinical-group hints.
Open tool - OASIS · Validator
OASIS-E2 Submission Validator
Run the top 18 fatal iQIES edits against a synthetic OASIS-E2 record before submission, with verbatim CMS rule text on every finding.
Open tool
PDF · Print-ready
The PDF
A standalone publication, not a printout
The full manual as a single branded PDF — cover page, table of contents, chapter breaks, and citations laid out for print. Drop it on a shared drive, post it on the office wall, or hand it to a new hire on day one.
- Editorial typography — built to be read, not skimmed
- Every claim cited to a CMS source
- Updated when CMS publishes changes
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We’ll email you when CMS publishes changes
Quarterly Q&As, OASIS-E2 corrections, and new section releases. No spam — just the changes that affect this manual.
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