How to Fill Out and Submit the CMS MDS 3.0 Assessment Form

Filling out and submitting the CMS MDS 3.0 assessment means completing the standardized resident assessment on the current item set (v1.20.1, effective October 1, 2025), coding each section against its look-back period from an Assessment Reference Date, and transmitting the encoded file through the Internet Quality Improvement and Evaluation System (iQIES) within 31 days of completion.¹ A registered nurse must conduct or coordinate the assessment, and the interdisciplinary team supplies data from direct observation, resident interviews, and clinical records.²

Who Completes the Assessment and Signs for It

An RN coordinates the assessment, but the coding is a team effort. Nurses observe daily care, social workers gather psychosocial history, dietary staff document intake, and therapists report on rehabilitation. Federal regulation requires direct observation and communication with the resident, plus input from direct care staff across all shifts.²

Every person who completes a portion of the MDS must sign and certify the accuracy of what they entered.² Those signatures carry legal weight. Knowingly certifying a false statement can trigger civil money penalties of up to $1,000 per assessment for the individual who signs, or up to $5,000 per assessment for anyone who causes another person to certify false information.³

Identify the Assessment Type and Its Deadline

Before you code anything, know which assessment you are completing. The type controls the item set, the window for the Assessment Reference Date, and the completion deadline.⁴

OBRA Assessments (All Residents)

Admission (Comprehensive): complete within 14 calendar days of admission.³
Quarterly Review: complete every 92 days, measured from the completion date of the prior quarterly.
Annual Reassessment (Comprehensive): complete within 366 days of the most recent comprehensive assessment.
Significant Change in Status (Comprehensive): complete within 14 calendar days of determining that a meaningful change occurred.
Significant Correction: complete within 14 days of identifying a major error in a prior assessment.

Admission and annual reassessments use the full comprehensive item set. Quarterly reviews use a shorter item set focused on the most dynamic clinical areas.⁴

Medicare PPS Assessments

For residents in a Medicare Part A skilled stay, the 5-Day assessment is the critical one because it sets the initial payment classification. Its ARD must fall on days 1–5 of the stay, with grace days 6–8. An Interim Payment Assessment (IPA) is optional and used when the resident’s clinical status changes enough to warrant reclassification. Under the Patient-Driven Payment Model, the older 14-Day, 30-Day, 60-Day, and 90-Day PPS assessments are no longer required for payment.⁴

Set the Assessment Reference Date and Look-Back Period

The Assessment Reference Date (ARD) is the anchor for the entire MDS. It marks the last day of the observation window, and almost every section codes backward from it. Unless the RAI Manual specifies otherwise, the default look-back is seven days ending at 11:59 p.m. on the ARD.⁴

Choosing the ARD is a clinical decision, not just paperwork. For PPS assessments, the ARD must fall within the designated window for that assessment type. Setting it a day too early or too late can invalidate the assessment or misrepresent the resident’s status. If a fall, a new pressure ulcer, or a change in therapy happens the day after the ARD closes, it cannot appear on that assessment.

One important exception to the seven-day default: Section GG uses a three-day look-back. That shorter window makes functional coding more sensitive to recent performance and is a frequent source of coding errors.

Work Through the Sections

The Comprehensive item set spans more than a dozen sections. Each has its own coding rules, but the pattern is the same: gather data during the look-back period, follow the manual’s item-specific instructions, and code what you observed or what the resident reported.

Section A — Identification: legal name, Social Security number, Medicare number, Medicaid number if applicable, the type of assessment being performed, and the ARD.
Section B — Hearing, Speech, and Vision: the resident’s ability to understand and communicate.
Section C — Cognitive Patterns: use the Brief Interview for Mental Status (BIMS) for residents who can participate; use the staff assessment of cognition only when they cannot.
Section D — Mood: screen for depressive symptoms using the PHQ-9 resident interview, or a staff observation when the interview is not possible.
Section GG — Functional Abilities and Goals: self-care and mobility performance during a three-day look-back.
Section I — Active Diagnoses: medical conditions actively affecting care.
Section J — Health Conditions: pain assessment, fall history, and other indicators.
Section K — Swallowing/Nutritional Status: diet type, swallowing problems, nutritional intake.
Section M — Skin Conditions: pressure ulcer staging and other wound documentation.
Section N — Medications: medication regimen review, including antipsychotic use.
Section O — Special Treatments and Procedures: therapies, ventilator use, IV medications, and other interventions during the look-back.

Sections C and D are built around structured resident interviews, and federal regulation requires that the MDS incorporate the resident’s own account of their abilities, preferences, and goals whenever possible.² Defaulting to staff assessment when the resident could participate is a protocol violation, not a shortcut.

Coding Section GG Correctly

Section GG carries the most reimbursement weight and produces the most coding errors. It assesses the resident’s usual performance over the past three days, and its scale is reversed from the older Section G: a higher score means greater independence.⁵

The scale for each activity:

06 — Independent: resident completes the activity without helper assistance.
05 — Setup or clean-up assistance: helper sets up or cleans up; resident performs the activity.
04 — Supervision or touching assistance: helper provides verbal cues or light steadying contact.
03 — Partial/moderate assistance: helper does less than half the effort.
02 — Substantial/maximal assistance: helper does more than half the effort.
01 — Dependent: helper does all of the effort, or the activity requires two or more helpers.

Three additional codes cover activities that were not performed: 07 (resident refused), 09 (not applicable), and 88 (not attempted due to medical condition or safety concerns).⁵

Self-Care Items

Score each task independently: eating, oral hygiene, toileting hygiene, washing the upper body, showering or bathing, upper body dressing, lower body dressing, putting on and taking off footwear, and personal hygiene. A resident who can feed themselves may still need full assistance with dressing.

Mobility Items

Mobility is broken into granular skills rather than lumped together. Bed mobility is split into rolling left and right, sitting to lying, and lying to sitting on the side of the bed. Transfers are separated into sit to stand, chair-to-bed transfer, toilet transfer, tub or shower transfer, and car transfer. Walking is measured at 10 feet, 50 feet with two turns, and 150 feet to gauge stamina. The section also covers wheelchair mobility and stair navigation.

Because the Section GG functional score directly determines the PT, OT, and nursing classifications under PDPM, sloppy coding has outsized financial and legal consequences. Overcoding a resident’s dependence exposes the facility to False Claims Act liability.⁶

Coding Pitfalls to Watch For

When information genuinely cannot be obtained (the resident is comatose with no available history, for instance), a dash code indicates the item was not assessed. Dashes are a last resort. Overusing them triggers system warnings during submission, and a pattern of dashes across assessments can flag the facility during state surveys.

Errors that show up repeatedly in validation reports:

Scoring Section GG on the wrong scale. Staff trained on the old Section G instinctively code higher numbers for more dependent residents. In Section GG, 06 is independent and 01 is dependent.
Using the wrong look-back period. Applying seven days to Section GG items, or three days to items that use seven, produces inaccurate data.
Coding events that fall outside the look-back window for the set ARD. If it didn’t happen during the window, it doesn’t get coded.
Skipping the resident interview and defaulting to staff assessment in Sections C and D when the resident could participate.

Download the Correct Item Set First

Before you start, confirm the version. CMS hosts the RAI User’s Manual, item sets, and supporting documents on the MDS 3.0 Resident Assessment Instrument page. The current manual is v1.20.1, effective October 1, 2025, and the current item sets are v1.20.1v4.¹

The downloads page also includes item sets categorized by type (Comprehensive NC, Quarterly NQ, PPS, Discharge, and others), an Item Matrix showing which items appear on which assessment, and change tables and errata that identify field-level revisions between versions. CMS periodically updates Appendix B with revised contact lists for State RAI Coordinators and MDS Automation Coordinators, so check the page between major version changes too.

If your electronic health record vendor has not updated to the current version, contact them immediately. The facility bears responsibility for submitting on the correct version regardless of what the software defaults to.

Submit Through iQIES

Completed assessments transmit electronically through iQIES at iqies.cms.gov. Authorized facility users log in and upload the encoded assessment file, which the system processes into the national MDS database. iQIES replaced the older CASPER reporting infrastructure for MDS submissions.

The federal transmission deadline is 31 days from the MDS completion date. For comprehensive assessments, the 31 days runs from the Care Plan Completion Date. Facilities must also transmit at least monthly, meaning all assessments completed during the previous month should be included in at least one monthly batch.⁷

Waiting until day 31 is risky. If the system rejects the file for fatal errors, you still need time to correct and resubmit within the window. Most experienced MDS coordinators transmit weekly or biweekly to build in a buffer.

Read the Validation Report and Fix Errors

Within 24 hours of a successful upload, iQIES generates a Final Validation Report listing every error detected in the submitted records, categorized by severity.⁸

Fatal errors: the record was rejected. Every fatal error must be corrected and the record resubmitted. Common triggers include invalid date combinations, missing required fields, and logic conflicts between sections (for example, coding a resident as comatose in Section B while scoring full independence in Section GG).
Warnings: the record was accepted but contains a potential inconsistency. Warnings do not block the submission, but a pattern of unresolved warnings can signal data quality problems during a survey.

If fatal errors prevent the system from generating the standard Final Validation Report, the submitter can request a Submitter Final Validation Report through iQIES to identify what went wrong.⁸

Modifying or Inactivating an Accepted Record

When you discover an error in a record already accepted into the database, there are two correction paths. A modification replaces the inaccurate record with a corrected version; the original moves to the history file and the corrected record becomes active. An inactivation removes the record from the active database without replacing it, which is appropriate when the record should never have been submitted (wrong resident, wrong assessment type, or a test record sent as production). Both processes require an MDS Correction Request form.⁷

For a major error that changes the clinical picture, the facility must submit the modification and then complete a Significant Correction of a Prior Assessment, which involves performing a new assessment and updating the care plan. A wrong reason-for-assessment code in Section A always requires inactivation and resubmission rather than a simple modification.⁷

1
Centers for Medicare & Medicaid Services. Minimum Data Set 3.0 Resident Assessment Instrument Manual
2
eCFR. 42 CFR 483.20 – Resident Assessment
3
Office of the Law Revision Counsel. 42 U.S. Code 1395i-3 – Requirements for, and Assuring Quality of, Care in Skilled Nursing Facilities
4
Centers for Medicare & Medicaid Services. Chapter 2 – The Assessment Schedule for the RAI
5
Centers for Medicare & Medicaid Services. Minimum Data Set Version 3.0 – Sections A and GG
6
Centers for Medicare & Medicaid Services. PDPM Calculation Worksheet for SNFs
7
Centers for Medicare & Medicaid Services. Chapter 5 – Submission and Correction of the MDS Assessments
8
CMS QIES Technical Support Office. iQIES MDS Error Message Reference Guide