CPT
90471 — Immunization administration, single vaccine
ACA-covered vaccines should be free, including the admin fee.
Telehealth
99421 — Online digital E/M, established patient; 5-10 minutes cumulative over 7 days
This code covers an online or digital evaluation and management service — such as a secure patient portal message exchange — for established patients, when the total physician time in reviewing messages and providing ...
- Typical setting: Online (asynchronous)
- National avg charge (illustrative): $15-$35 Medicare allowed (approx. $15-$25 national Medicare average; commercial payers $20-$45)
- Most-disputed reason: Billing for new patients: 99421-99423 are for established patients only — new patients require a different code path
What it means
What 99421 actually means
This code covers an online or digital evaluation and management service — such as a secure patient portal message exchange — for established patients, when the total physician time in reviewing messages and providing medical advice over a 7-day period is 5 to 10 minutes. It cannot be billed if it results in an in-person visit within 7 days.
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 for new patients: 99421-99423 are for established patients only — new patients require a different code path
- Inappropriate bundling with in-person visit: billing 99421 when the online encounter leads to an in-person visit within 7 days — the online service is considered part of the in-person visit
- Time inflation: billing 99421 for only a brief message reply without documenting cumulative total time reaching the 5-minute minimum
If you see 99421 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 99421 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 99421 on a bill.
99421 FAQ
Plain-English answers.
What does 99421 usually cost?
$15-$35 Medicare allowed (approx. $15-$25 national Medicare average; commercial payers $20-$45). 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 99421?
Billing for new patients: 99421-99423 are for established patients only — new patients require a different code path
What should I do if I see 99421 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 99421 before paying.
Don't pay 99421 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.