CPT
90471 — Immunization administration, single vaccine
ACA-covered vaccines should be free, including the admin fee.
Mental health
90785 — Interactive complexity; add-on code for specified psychiatric procedures
This is an add-on code (cannot be billed alone) that captures additional complexity when specific communication difficulties are present during a psychiatric or therapy session — such as when a guardian is involved, a...
- Typical setting: Therapist's office, hospital, telehealth
- National avg charge (illustrative): $10–$30 additional (add-on to primary service)
- Most-disputed reason: Billing 90785 as a standalone charge without a primary psychiatric procedure code — it is exclusively an add-on code and cannot appear alone.
What it means
What 90785 actually means
This is an add-on code (cannot be billed alone) that captures additional complexity when specific communication difficulties are present during a psychiatric or therapy session — such as when a guardian is involved, a translator is needed, or maladaptive communication from family members complicates care delivery. It must be billed alongside a primary psychiatric service code.
Common errors with this code
What goes wrong on real bills.
Most bills that look correct still contain at least one of these issues. Up to 49% of medical bills contain errors (CFPB).
- Billing 90785 as a standalone charge without a primary psychiatric procedure code — it is exclusively an add-on code and cannot appear alone.
- Adding 90785 routinely to every session without documented complicating factors — specific conditions must be met and documented each time it is billed.
- Billing 90785 with crisis codes (90839/90840) or E/M codes when no psychotherapy service is also reported — it cannot be combined with these services per CPT guidelines.
If you see 90785 on your bill
Three steps before paying.
1. Get the itemized bill. If your statement only shows a summary, request the CPT-level itemized bill before paying. Generate the request language →
2. Cross-check against the EOB. Compare what your insurer's Explanation of Benefits says you owe versus what the hospital is asking. They disagree more often than people think. Read the bill-vs-EOB guide →
3. Run a free Bill Scan. Upload the bill (and EOB if you have it) and BillBusted will flag the most likely issues with this specific code in your specific state. Run free scan →
Related codes
Other codes in this category.
People who land on 90785 often also see these adjacent codes on the same bill.
CPT
90472 — Immunization admin; each additional vaccine
Vaccine — admin (90471) is separate from the vaccine product code.
CPT
90651 — Human papillomavirus vaccine types 6, 11, 16, 18, 31, 33, 45, 52, 58, nonavalent , IM
Vaccine — admin (90471) is separate from the vaccine product code.
CPT
90670 — Pneumococcal conjugate vaccine, 13 valent , IM
Vaccine — admin (90471) is separate from the vaccine product code.
CPT
90671 — Pneumococcal conjugate vaccine, 15 valent , IM
Vaccine — admin (90471) is separate from the vaccine product code.
CPT
90677 — Pneumococcal conjugate vaccine, 20 valent , IM
Vaccine — admin (90471) is separate from the vaccine product code.
Related BillBusted guides
Plain-English reads if you see 90785 on a bill.
90785 FAQ
Plain-English answers.
What does 90785 usually cost?
$10–$30 additional (add-on to primary service). Costs vary by region, payer contract, and whether the service was performed in a hospital outpatient department (which adds a facility fee) versus a free-standing clinic.
What's the most common billing error on 90785?
Billing 90785 as a standalone charge without a primary psychiatric procedure code — it is exclusively an add-on code and cannot appear alone.
What should I do if I see 90785 on my bill?
Request the itemized bill and the matching EOB from your insurer. Compare the units/quantity billed against what you actually received. Run a free BillBusted scan to flag the most likely errors specific to 90785 before paying.
Don't pay 90785 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.