HCPCS code J1100: Dexamethasone injection, per 1 mg2026 Medicare rate & RVUs in Guam
Identifies injectable dexamethasone sodium phosphate by 1 mg unit for a covered dose administered as drug therapy.
CMS doesn’t publish an office rate for J1100 in Guam.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What J1100 covers
J1100 identifies injectable dexamethasone sodium phosphate, a corticosteroid used for systemic treatment of inflammatory and allergic conditions. It is reported for the drug administered in settings such as an office, clinic, emergency department, or hospital. The code identifies the medication and its quantity, not the service of administering it; the administration service is represented separately when reportable.
CMS assigns J1100 physician fee schedule status E, excluding it from that schedule. When Medicare covers the drug, payment is made under another method. HCPCS classifies it as a Part B drug, generally priced from CMS quarterly ASP drug pricing files when covered. Special Medicare coverage instructions apply. Each unit represents 1 mg of dexamethasone sodium phosphate, so a 6 mg dose is 6 units.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
J1100 in Hawaii, Guam, HI
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam, HI | Unavailable | Unavailable |
How the J1100 rate is calculated
Each of J1100’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · J1100
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense0.00
0.00 RVUs× 1.000 GPCI
Malpractice0.00
0.00 RVUs× 1.000 GPCI
Adjusted RVUs
0.0000
Conversion factor
$33.4009
Medicare rate
$0.00
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for J1100
J1100 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.
Place of service · J1100
Which rate does Medicare pay?
The POS code on the claim line (CMS-1500 box 24B).
POS 11 · non-facility rate · national
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J1100 isn’t priced in this setting.
J1100 compared with similar codes
Compare codes · National
J1100 vs J8540 vs J3301: Medicare rates
How to choose
- J8540Oral dexamethasonePer 0.25 mg
- J8540 identifies oral dexamethasone in 0.25 mg units. J1100 identifies injectable dexamethasone sodium phosphate in 1 mg units.
- J3301Triamcinolone injectionPer 10 mg
- J3301 identifies injectable triamcinolone acetonide in 10 mg units. J1100 identifies dexamethasone sodium phosphate in 1 mg units.
J1100 billing questions
How many units should be reported?
One unit represents 1 mg of dexamethasone sodium phosphate. A 6 mg dose is 6 units.
Does J1100 include injection administration?
J1100 identifies the drug, not the administration service. A separately reportable administration service is represented by its own code.
When should J1094 be used instead?
J1094 identifies the same drug in 0.1 mg units. J1100 represents 1 mg per unit.
Does J1100 specify an administration route?
No. J1100 identifies the drug and its 1 mg unit.
How does Medicare treat J1100?
CMS assigns physician fee schedule status E. When covered, the drug is a Part B drug generally priced from CMS quarterly ASP drug pricing files, and special Medicare coverage instructions apply.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
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