Drugs & infusions
J1100 — Dexamethasone sodium phosphate, 1 mg
Dexamethasone is a powerful steroid injection used to reduce severe inflammation, allergic reactions, and swelling in the brain or joints.
- Typical setting: Hospital, outpatient clinic
- National avg charge (illustrative): $5–$30 per dose (drug cost)
- Most-disputed reason: Quantity inflation: 10 mg dose = 10 units of J1100; billing 100 units is a 10x overbill
What it means
What J1100 actually means
Dexamethasone is a powerful steroid injection used to reduce severe inflammation, allergic reactions, and swelling in the brain or joints. A common dose is 4–10 mg; since the code is per 1 mg, expect 4–10 units on your bill.
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).
- Quantity inflation: 10 mg dose = 10 units of J1100; billing 100 units is a 10x overbill
- Confusion between J1100 (dexamethasone sodium phosphate) and J3301 (triamcinolone) — verify which steroid was actually given
- Billing J1100 without a corresponding injection administration code (96372)
If you see J1100 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 J1100 often also see these adjacent codes on the same bill.
Related BillBusted guides
Plain-English reads if you see J1100 on a bill.
J1100 FAQ
Plain-English answers.
What does J1100 usually cost?
$5–$30 per dose (drug cost). 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 J1100?
Quantity inflation: 10 mg dose = 10 units of J1100; billing 100 units is a 10x overbill
What should I do if I see J1100 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 J1100 before paying.
Don't pay J1100 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.