Doctor profile · Federal record
Dr. Dara Grennan
Infectious Disease Physician (CMS: Hospitalist) · Internal Medicine Physician · Hospitalist Physician · Hospitalist Physician · Dixon, IL
- NPI 1518282938
- Accepts Medicare
- MIPS 91.3 / 100 · 2023
- 19 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
403 E 1St St
Dixon, IL 61021
(815) 285-5629
fax (815) 285-5634 - Additional location
-
5121 S Cottonwood St, 3Rd Floor
Salt Lake City, UT 841075701
(801) 507-4384 - Mailing address
-
680 N Lake Shore Dr
Chicago, IL 606114546
Credentials & registration
- NPI registered
- March 2010 — 16 yrs on file
- Profile last updated
- April 26, 2021
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 207RI0200X — NUCC code
- State licenses (3)
- Illinois #036-137502 · Utah #8153445 · Illinois #36.137502
- Medicaid
- IL #036137502
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1518282938. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
25
Distinct HCPCS
1
Medicare allowed
$3,454
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 25 | 25 | $138 |
In context: peer comparison
Among 2 peers in this city , average services per provider: 121. This provider delivers 0.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
424
Patients
12
Total drug cost
$775,112
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Biktarvy (Bictegrav/Emtricit/Tenofov Ala) | Brand | 95 | 12 | $407,671 |
| Dovato (Dolutegravir Sodium/Lamivudine) | Brand | 64 | 0 | $207,510 |
| Atorvastatin Calcium | Generic | 50 | 0 | $1,279 |
| Gabapentin | Generic | 28 | 0 | $676 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 24 | 0 | $1,799 |
| Hydrochlorothiazide | Generic | 22 | 0 | $240 |
| Nifedipine Er (Nifedipine) | Brand | 21 | 0 | $600 |
| Prezcobix (Darunavir/Cobicistat) | Brand | 20 | 0 | $52,944 |
| Trulicity (Dulaglutide) | Brand | 19 | 0 | $24,388 |
| Ibuprofen | Generic | 16 | 0 | $173 |
Hospital affiliations
Frequently asked questions
What is Dr. Dara Grennan's medical specialty?
Dr. Dara Grennan practices Infectious Disease Physician in Dixon, IL.
Where does Dr. Dara Grennan practice?
Dr. Dara Grennan practices at 403 E 1St St, Dixon, IL 61021. Office phone: 8152855629.
What is Dr. Dara Grennan's NPI?
Dr. Dara Grennan's National Provider Identifier (NPI) is 1518282938, issued by NPPES.
Does Dr. Dara Grennan accept Medicare assignment?
Yes. Dr. Dara Grennan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Dara Grennan commonly perform?
Top Medicare-reported procedures in 2023: Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222). Source: CMS Medicare Physician & Other Practitioners file.