Authorization Units vs. Sessions and a Mid-Course Payer Rule Change

Two separate problems are being conflated:

1. Authorization/unit issue (sessions 11–12). The authorization was for 12 units, and the practice billed 12 sessions = 12 units. On its face that should fit. But the February bulletin limited 90853 to one unit per day and imposed a documentation condition for sessions over 60 minutes. If the payer's system re-adjudicated under the new rule and any claim was submitted with more than one unit on a date, or if the authorization was interpreted differently, denials can result. The practice must pull the actual denial reason codes (e.g., CO-197 preauth, CO-151) rather than assume.
2. Documentation issue (earlier claims). The 75-minute sessions exceed 60 minutes, and the bulletin requires a treatment-plan justification attached to the claim. If the practice did not attach it, those claims fail the payer's condition regardless of authorization.

Key distinction: Authorization is about whether and how many units are covered; the bulletin is about how each unit must be documented. A valid authorization does not cure a missing documentation attachment, and good documentation does not cure an exceeded authorization.

First step: obtain the remittance advice and read each denial code before drafting any appeal.

Appeal structure - do not batch blindly:

1. Segment by denial reason. Group claims denied for missing justification separately from claims denied for authorization/units. Each needs different evidence.
2. Documentation-denial appeals: attach the treatment-plan justification for each >60-minute session showing why 75 minutes was medically necessary (e.g., group process required extended time). Include the note, the plan, and the bulletin compliance statement.
3. Authorization-denial appeals: include the authorization approval (12 units, dates), the attendance record showing 12 sessions, and a reconciliation showing one unit per session/date. If the payer's one-unit-per-day rule was applied retroactively, cite the effective date of the bulletin and argue non-retroactivity if the payer's policy supports it.
4. Reference the specific denial codes and the payer's appeal timeline; miss the deadline and the appeal is lost.

Going forward:

• Build the >60-minute justification into the standard workflow so it attaches automatically.
• Track authorization units against sessions in real time; request an extension before units run out.
• Monitor payer bulletins and update templates/claims when rules change mid-authorization period.
• Confirm whether the one-unit-per-day rule affects any dates with multiple units and correct future claims.

Partially, but not entirely. Authorization only establishes that the payer agreed to cover a defined number of units for a defined period. It does not waive:

• the requirement to document medical necessity for each session,
• the bulletin's attachment requirement for >60-minute sessions, or
• the one-unit-per-day limit.

So the earlier denials for missing justification are the practice's error, not the payer's - the authorization never excused that condition. The sessions 11–12 denials may be the payer's error if the practice can show 12 sessions = 12 units, one per date, within the authorization period; that is a legitimate appeal. But the manager should not assume; the remittance codes will show whether the denial is unit-based or documentation-based.

Bottom line: appeal the meritorious denials with evidence, correct the process for the rest, and stop treating authorization as a substitute for per-claim documentation.