CPT
90471 — Immunization administration, single vaccine
ACA-covered vaccines should be free, including the admin fee.
Emergency department
99284 — Emergency department visit, level 4 (high)
High-complexity ER visit. Significant workup, moderate-to-high risk.
- Typical setting: Hospital emergency department
- National avg charge (illustrative): Facility $2,500-$5,500; physician $500-$1,200.
- Most-disputed reason: Routine workup billed at level 4.
What it means
What 99284 actually means
CPT 99284 is a high-complexity ER visit. The chart should show extensive workup, multiple problems, or a high risk of morbidity. Examples: chest pain workup with negative imaging, suspected appendicitis with imaging.
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).
- Visit that resolved diagnostically as low-acuity but billed as 99284.
- Both facility 99284 and physician 99284 charged separately, doubling the cost.
- Out-of-network physician balance billing despite in-network ER.
If you see 99284 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 99284 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 99284 on a bill.
99284 FAQ
Plain-English answers.
What's the difference between 99284 and 99285?
99285 requires immediate threat to life or function (stroke, MI, severe trauma, status asthmaticus). If your visit didn't involve life-threatening urgency, 99284 is the upper bound.
Don't pay 99284 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.