Section GG is the single biggest source of PDPM contractor takebacks. Where the score and the chart diverge, the discrepancy compounds across every claim the MDS supported. Here is the methodology contractor reviewers actually run.
What Section GG drives
Under the Patient-Driven Payment Model (PDPM), Section GG functional scoring drives both the PT and OT case-mix components of every Medicare SNF claim. Self-care items (GG0130) and mobility items (GG0170) translate to performance scores, the scores feed the PDPM case-mix groups, and the case-mix groups determine the daily rate for the entire stay. A misscore on a single item can shift the case-mix group and reduce the rate per day across the remainder of the stay.
It is the math that makes Section GG the case-mix item contractor reviewers test first.
The methodology contractor reviewers actually run
Internal MDS audit typically tests whether Section GG is completed. Contractor methodology tests something different: whether the clinical record across the seven-day look-back supports the score that was coded. The reviewer starts from the MDS, looks at the case-mix output (the PDPM HIPPS code), and works backward to the chart. The question is not is the MDS completed - the question is does the clinical record support the score on the MDS.
When the clinical record supports a different score - usually a less acute one - the finding gets built on the discrepancy, not on the MDS itself. The case-mix recode follows. The takeback follows the recode.
Three specific places Section GG findings concentrate
One - admission performance scoring done from the chart, not the observation
The RAI User's Manual instructs that admission performance scoring should be based on observed performance during the three-day window by qualified clinicians. In practice, MDS coordinators frequently complete Section GG from chart review after the look-back has passed, using nursing notes and therapy evaluations to infer what performance must have been. When CNA documentation, nursing flowsheets, and therapy notes all describe a higher level of independence than the MDS reflects, the contractor sample produces the discrepancy finding.
Two - activity-not-attempted codes used as defaults
Codes 07, 09, 10, and 88 (activity not attempted for various reasons) are intended for specific clinical situations. They are not intended as default codes when an observation was not made. Contractor methodology tests whether the underlying clinical reason for activity-not-attempted is documented. When it is not, the recode follows.
Three - shift-to-shift documentation conflicts
The story the chart tells across all three shifts and the score the MDS tells should match. When day-shift CNA documentation describes independent eating and night-shift describes substantial assistance, the contractor methodology will identify the conflict and ask which is correct. The chart needs to be internally consistent or the discrepancy itself is the finding.
Why the takeback compounds
Section GG is not a per-claim error. It is a per-MDS error, and the MDS supports every claim within the look-back. A Section GG misscore that shifts the PDPM case-mix group reduces the rate per day for the entire stay. On a 30-day stay, that can be a $1,500 to $4,500 takeback per resident on a single discrepancy. Multiply by sample size, multiply by sampling extrapolation, and the exposure compounds quickly.
This is the math that makes Section GG the single most-cited finding in PDPM contractor takebacks since the model's implementation in 2019.
What the internal program needs to run differently
The pattern Precisian sees across nursing facility engagements: internal MDS audit tests completeness; contractor methodology tests defensibility. Closing that gap requires three operational moves.
- Audit reconciles MDS to chart, not MDS to standard. Internal review of Section GG should start from the score and work backward to the chart, looking for the supporting documentation across all three shifts during the look-back. Reconciling the chart to the standard catches one kind of error. Reconciling the chart to the actual score catches the kind contractors actually find.
- Activity-not-attempted codes require chart-level justification. Each instance of 07, 09, 10, or 88 should have a documented clinical rationale supporting the code. Defaulted codes are the easiest finding for a contractor to write.
- Shift-to-shift consistency is a separate audit dimension. Cross-shift documentation conflicts should be flagged during the seven-day look-back, not discovered at contractor sample. The IDT can resolve real conflicts; the documented conflicts that remain become findings.
What this looks like in a real diagnostic
The methodology above is one of the eight sections in our day-one MDS diagnostic. The full 27-item audit covers MDS scheduling, Section GG, Section I active diagnoses, Section J health conditions, Section K nutritional, Section O special treatments, care area assessments, and quality oversight - all the case-mix and survey areas that contractor methodology tests.
If you want to walk the diagnostic on your own program: the Nursing Facilities case file is here. The 27-item audit referenced above is sent as a PDF from the lead-magnet form on the home page, or as part of any discovery call. Open a case file with us if a sharper read on your Section GG defensibility would be useful.