CPT 90847: whose chart does this session go in?

90847 covers family psychotherapy, conjoint, with the identified patient present, with a descriptor time of 50 minutes. Most payers expect a session of at least 26 minutes — more than half the stated time — to bill it, though this is a payer convention rather than a universal rule and is worth confirming.

The identified patient

This is the concept the whole code rests on, and it is where most 90847 problems begin.

Insurance reimburses treatment of an individual with a diagnosis. Even when the clinical unit is a family or a couple, the claim identifies one person as the patient, and the session is billed under their benefits, documented in their chart, and justified against their diagnosis and treatment plan.

This creates a genuine and well-known tension with systemic practice. An LMFT treating a couple may reasonably regard the relationship as the client. The billing system has no way to represent that. The result is a practical compromise: one partner is the identified patient, their diagnosis supports the treatment, and the note records family work as the intervention advancing their treatment goals.

What does not make a session 90847

The most common upcoding error with this code is treating any session with an additional person present as family therapy.

• A partner joining for the last ten minutes to hear a summary is generally not conjoint family therapy. The intervention was individual.
• A parent providing collateral history at the start of a child's session is usually part of the individual session, not a separate family service.
• A family member present for practical reasons — transport, language, or the client's preference — does not convert the code if the therapeutic work was individual.

The test is what the intervention was, not who was in the room. If the family relationships themselves were the object of the work, that is 90847. If one person was treated and others observed or contributed information, that is individual therapy.

The reverse error

The opposite also happens: genuinely conjoint sessions billed as 90834 because the clinician is uncertain about family coding or because the scheduling system defaults to individual. This under-bills systemic work that is often more demanding than individual work, and it produces a chart that does not reflect the treatment actually delivered.

Why 90847 gets denied

1. No covered diagnosis for the identified patient. Relational problems coded only as Z-codes are frequently not covered. Where a clinical diagnosis is genuinely present it should be documented; where it is not, the honest answer may be that the work is not covered.
2. Two family members billed for the same session. Billing both partners individually for one conjoint session is duplicate billing, not two services.
3. Plan exclusions. Some plans exclude family or couples therapy outright, or cover it only where it is incident to treatment of the identified patient's condition.
4. Insufficient duration. Sessions falling short of the payer's threshold — commonly 26 minutes — may be denied or downcoded.
5. Missing documentation of who attended. The note should record participants by role. Its absence makes the service unverifiable.

Documentation

• Who attended, by role — identified patient, partner, parent, sibling.
• Session duration.
• The identified patient's diagnosis and the treatment plan goal advanced.
• The systemic intervention used, described — not a narrative of the conversation. "Facilitated structured communication exercise to interrupt pursue-withdraw pattern" is an intervention.
• What each participant contributed and how the identified patient responded, distinguishing the couple's process from the individual's progress.

Adjacent codes

• 90846 — family psychotherapy without the patient present.
• 90853 — group psychotherapy, a different structure entirely.
• 90849 — multiple-family group psychotherapy.
• 90834 — individual, where the work was individual.

What Weft does with this

Weft models the system rather than the seat. Every participant in a session is tracked, the note distinguishes what the couple or family did from what the identified patient did, and the family work is written against the identified patient's active treatment plan goals — which is what makes a conjoint session defensible as covered treatment rather than an uncovered relational service.

The coverage problem, stated honestly

There is an uncomfortable truth under family coding that most billing guides avoid.

Insurance covers treatment of illness. A couple seeking help with communication, where neither partner has a diagnosable condition, is not seeking treatment of illness in the sense a payer recognises — and coding a relational problem as an anxiety disorder to obtain coverage is misrepresentation, whatever the clinical sympathy behind it.

The legitimate cases are genuine and common: one partner has a diagnosed condition, the family system is materially involved in its maintenance or its treatment, and conjoint work is a clinically indicated intervention for that condition. That is coverable and defensible.

Where no such diagnosis exists, the honest options are private pay or a clear conversation with the client about what their benefits do and do not cover. Practices that resolve this by finding a diagnosis are taking a risk that lands on the clinician, not the client.

A documentation example

Two versions of the same session, to make the standard concrete.

Session with client and partner. Discussed ongoing conflict about household responsibilities. Both expressed frustration. Explored patterns. Client reports feeling unheard. Will continue next week.

That is a record of a conversation. It names no intervention, no diagnosis link, no goal, and no participant roles.

Conjoint session, 50 minutes. Present: client (identified patient, MDD recurrent, moderate) and spouse. Goal addressed: "client will initiate one direct request per week without withdrawing," active since 12 May. Intervention: structured speaker-listener exercise targeting the demand-withdraw cycle; coached spouse in reflective response to interrupt escalation. Client initiated two direct requests in session, tolerating spouse's initial defensiveness without withdrawing — first observed instance. Spouse able to reflect without counter-argument by second round. Plan: rehearse at home twice before next session; reassess PHQ-9 at next individual.

Same session, same length, same clinicians. The second is a defensible billable service and the first is not.

Minors and family coding

With minors the identified patient is almost always the child, which resolves the designation question but creates others.

Parents attending a session with the child is frequently 90847 rather than individual therapy with a guardian present, provided the family relationships were the object of the work. Sessions with parents alone are 90846. Sessions where the child is present and the parent supplies history at the start are usually individual.

The practical complication is that child treatment often moves between all three within a fortnight, and the coding has to follow the actual configuration each time rather than settling on a habitual default. That is a documentation discipline more than a coding difficulty — record who attended and what the work was, and the code follows.

Verified 29 July 2026 against AMA CPT descriptors and CMS published guidance. Code definitions are national; coverage, reimbursement and documentation expectations are set by individual payers and vary by plan, state and contract. Primary references: AMA CPT; CMS Physician Fee Schedule; APA Services. This page is billing reference, not legal or coding advice.