DR. DARA GRENNAN – Infectious Disease Physician, NPI 1518282938
Infectious Disease Physician
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Doctor Profile
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Profile Insights
NPPES metrics only — not quality of care.
259 HOSPITALIST in UT
Provider Addresses for DR. DARA GRENNAN
5121 S Cottonwood St
3rd floor
Salt Lake City, UT 841075701
Phone: (801) 507-4384
Type: Location
680 North Lake Shore Drive, 680, North Lake Shore Drive, Streeterville, Near North Side, Chicago, Cook County, Illinois, 60611, United States
CHICAGO, IL 606114546
Phone: (312) 956-8686
Type: Mailing
Katherine Shaw Bethea Hospital, 403, East 1st Street, Dixon, Lee County, Illinois, 61021, United States
DIXON, IL 61021
Phone: (815) 285-5629
Fax: (815) 285-5634
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2017-11-07
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20171107000107 | I | Hospitalist | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 25 | 25 | $0 |
Insurance plans in this area (ZIP 84107)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O P H T H A L M O L O G Y | IL | |
| Cardiac Electrophysiology, Cardiovascular Disease (Cardiology), Cardiovascular Disease (Cardiology) | MA | |
| - | IL | |
| - | IL | |
| O B S T E T R I C S/ G Y N E C O L O G Y | IL | |
| - | IL | |
| - | IL | |
| - | IL | |
| A N E S T H E S I O L O G Y | IL | |
| Physician Assistant | IL |
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