What “not medically necessary” means in a therapy denial

“Not medically necessary” is not a complete explanation by itself. It is a conclusion the health plan reached by applying clinical criteria to the information it reviewed. To understand the dispute, you need the criteria, the record, and the plan’s specific reasoning.

This article is general education, not clinical or legal advice. Only a treating professional can make clinical judgments about an individual's care, and the appropriate regulator or reviewer decides the formal dispute.

Start with the exact wording

Read the complete notice and identify:

• the service, level of care, and dates;
• whether the plan denied all care, part of the care, or a specific duration;
• the clinical criteria or guideline named;
• the reviewer and specialty, if stated;
• the records the plan says it reviewed;
• the facts the plan says did not meet the criteria;
• the instructions for obtaining the criteria or underlying information.

If the letter uses only a generic phrase and does not explain the basis, ask the plan for a complete written explanation and the criteria used.

Compare three things

The useful comparison is not “my clinician says yes and the plan says no.” Break it into three columns:

1. The plan's criterion: What must be present for the service or level of care?
2. The plan's stated reason: What does the denial say is absent, improved, unproven, or available at a lower level?
3. The clinical record: What dated, supportable facts address that point?

This structure can reveal a missing record, a factual error, an unclear criterion, or a genuine clinical disagreement. Do not invent facts to fill a blank.

Clinical facts that may matter

Depending on the service and record, a treating clinician may document:

• symptoms and functional impairment;
• treatment history and response;
• attempts at lower levels of care;
• why a lower level was insufficient or unsafe;
• risk and safety considerations;
• progress, setbacks, and discharge planning;
• the rationale for frequency, duration, or level of care.

These examples are not a checklist that every case must satisfy. The clinician decides what is accurate and relevant.

The plan's process also matters

California DMHC materials address how plans make and communicate behavioral-health medical-necessity decisions. DMHC's enforcement and Behavioral Health Investigations have also documented plan-specific problems such as confusing instructions, claims-system errors, access barriers, criteria communication, and grievance failures.

That history shows why it is worth checking the notice and record carefully. It does not prove that any particular denial is wrong.

Avoid two common mistakes

First, do not make an outcome claim from a statewide or plan-specific overturn percentage. Published percentages have different periods, plan sets, categories, and denominators. They cannot tell you the chance of success in one case.

Second, do not convert the clinician's facts into legal conclusions the clinician did not make. A strong factual record is more useful than exaggerated language.

A useful first page

Before writing a narrative, create one page with:

• service and dates;
• exact denial reason;
• cited criteria;
• plan's key factual assertion;
• clinician's supported facts that address it;
• missing documents or unanswered questions;
• official next-step instructions from the notice.

Parity can help a person organize these components for a narrow California beta. It does not decide medical necessity, replace the treating clinician, or guarantee that a plan or reviewer will agree.