CPT code 94645: Continuous inhalation, each additional hour2026 Medicare rate & RVUs in Pennsylvania
Report 94645 when continuous aerosol inhalation treatment for acute airway obstruction continues beyond the initial hour represented by 94644.
Medicare pays $15.34–$17.44 for 94645 in the office in Pennsylvania, from Rest of Pennsylvania to Metropolitan Philadelphia, PA. Which amount applies depends on the service address.
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 94645 covers
94645 represents continued continuous aerosol inhalation treatment for acute airway obstruction after the initial hour. A typical clinical situation is sustained nebulized medication treatment for acute bronchospasm. Respiratory therapists or other clinical staff may administer the treatment in a supervised outpatient setting under physician supervision.
Report 94644 for the initial hour and 94645 for each additional hour of continuous treatment; do not use this code for a series of separate, intermittent inhalation treatments. Document the indication, medication and delivery method, continuous treatment duration, and physician supervision. CMS fee-schedule valuation assigns no physician work RVU and includes practice-expense and malpractice RVUs. The service is billed as incident-to only when performed under physician supervision.
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.
Where 94645 pays more and less in Pennsylvania
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Philadelphia, PA | $17.44 | Unavailable |
| Rest of Pennsylvania | $15.34 | Unavailable |
How the 94645 rate is calculated
Each of 94645’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 · 94645
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense0.49
0.49 RVUs× 1.000 GPCI
Malpractice0.01
0.01 RVUs× 1.000 GPCI
Adjusted RVUs
0.5000
Conversion factor
$33.4009
Medicare rate
$16.70
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 94645
The CMS indicators that decide how 94645 is paid alongside other services.
CMS payment indicators · 94645
Continuous inhalation, each additional hour
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 5 | Incident-to service. |
94645 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 94644Continuous inhalationFirst hour
- 94644 represents the initial hour of continuous inhalation treatment; 94645 represents each additional hour.
- 94640Inhalation treatmentAcute obstruction or sputum induction
- Use 94640 for an inhalation treatment that is not reported as continued continuous treatment beyond an initial hour.
- 94642Pentamidine treatmentEach treatment
- 94642 concerns a discrete aerosol treatment; 94645 captures additional time in a continuous inhalation treatment.
94645 billing questions
Can 94645 be reported without 94644?
No. 94645 represents additional continuous treatment time after the initial hour reported with 94644.
How is 94645 different from 94640?
94645 applies to continued, continuous aerosol treatment beyond the initial hour. 94640 is used for an inhalation treatment that is not being reported as an additional hour of continuous therapy.
What documentation supports reporting an additional hour?
Record the clinical indication, medication and delivery method, elapsed continuous-treatment time, and the physician supervision under which the service was performed.
Does physician supervision affect billing?
Yes. CMS identifies this as an incident-to service, so it is billed only when performed under physician supervision.
How many units should be reported?
Report 94645 for each additional hour of continuous treatment after the initial hour represented by 94644. The record should support the duration billed.
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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