CPT
90471 — Immunization administration, single vaccine
ACA-covered vaccines should be free, including the admin fee.
Mental health
90853 — Group psychotherapy
This code covers group therapy sessions conducted by a licensed mental health professional for multiple unrelated patients at the same time.
- Typical setting: Therapist's office, hospital, telehealth
- National avg charge (illustrative): $30–$80 per patient per session (significantly less than individual therapy)
- Most-disputed reason: Billing 90853 at the same rate as individual psychotherapy — group therapy is reimbursed at a lower rate because the therapist's time is shared among all group members.
What it means
What 90853 actually means
This code covers group therapy sessions conducted by a licensed mental health professional for multiple unrelated patients at the same time. It is billed once per patient per group session, regardless of how many patients are in the group.
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 90853 at the same rate as individual psychotherapy — group therapy is reimbursed at a lower rate because the therapist's time is shared among all group members.
- Billing 90853 more than once per patient per day for the same group session — it is a once-per-patient-per-session code.
- Failing to verify that the group met minimum size requirements or that the patients were unrelated; some payers require a minimum number of participants.
If you see 90853 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 90853 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 90853 on a bill.
90853 FAQ
Plain-English answers.
What does 90853 usually cost?
$30–$80 per patient per session (significantly less than individual therapy). 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 90853?
Billing 90853 at the same rate as individual psychotherapy — group therapy is reimbursed at a lower rate because the therapist's time is shared among all group members.
What should I do if I see 90853 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 90853 before paying.
Don't pay 90853 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.