# CalculateProductivity.com — Full Technical & Statutory Specification (llms-full.txt)

## Editorial Governance
Published and audited by the **Workforce Operations, Clinical Billing & Timekeeping Standards Desk**. All calculation engines are deterministic client-side TypeScript modules verified against federal labor and clinical billing rules.

## Governing Statutes & Mathematical Formulas
1. **Clinical Therapy Net Productivity % & Reverse Clock-Out Time**:
   - `Net Worked Minutes = Gross Scheduled Shift Minutes - Unpaid Meal Break Minutes`
   - `Productivity % = (Billable Patient Care Minutes / Net Worked Minutes) * 100`
   - `Max Allowed Net Shift Minutes = Billable Patient Care Minutes / (Target Productivity % / 100)`
   - `Exact Clock-Out Timestamp = Shift Start Timestamp + Max Allowed Net Shift Minutes + Unpaid Meal Break Minutes`
   - `Documentation Cushion Minutes = Max Allowed Net Shift Minutes - Billable Patient Care Minutes`
2. **CMS Medicare Part B 8-Minute Rule (Medicare Benefit Policy Manual, Chapter 15, Section 220.3)**:
   - Timed CPT codes (`97110`, `97112`, `97116`, `97140`, `97530`, `97535`) are billed in 15-minute increments once a minimum threshold of 8 minutes is reached:
     - `8–22 mins = 1 unit`
     - `23–37 mins = 2 units`
     - `38–52 mins = 3 units`
     - `53–67 mins = 4 units`
     - `68–82 mins = 5 units`
     - `83–97 mins = 6 units`
   - Under CMS rules, remainder minutes across multiple timed CPT codes are summed first before dividing by 15. Under the AMA CPT Midpoint Rule, each code must independently reach at least 8 minutes.
3. **FLSA Meal Break & Rest Break Rules (29 CFR § 785.18 & § 785.19)**:
   - Short rest periods (`5–20 minutes`) are compensable paid work time (`29 CFR § 785.18`).
   - Bona fide meal periods (`>= 30 minutes` uninterrupted duty-free) are unpaid (`29 CFR § 785.19`) and extend the end-of-shift clock-out timestamp by the unpaid meal duration.
4. **CMS SNF PDPM Concurrent & Group Therapy Cap**:
   - Combined concurrent (`2 residents`) and group (`2–6 residents`) therapy minutes cannot exceed `25%` of total therapy minutes provided per discipline.
5. **Home Health OASIS-E Point Weights**:
   - Start of Care (SOC OASIS-E): `2.5 points`
   - Recertification / Evaluation / Resumption of Care: `1.5 points`
   - Routine Follow-Up Visit: `1.0 point`
6. **Percent-to-Goal & Labor UPH**:
   - `Percent to Goal = (Actual Output Units / Target Goal Units) * 100`
   - `Labor UPH = Actual Output Units / Net Direct Labor Hours`
   - `Calendar Months Effort = (Effort Percentage / 100) * 12` (or `* 9` for academic appointments).