Gregory Keelen, DO
NPI 1811905227 · Emergency Medicine Physician · Denison, TX
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Keelen, DO is a Emergency Medicine Physician provider in Denison, TX (NPI 1811905227).
Provider details
- NPI number
- 1811905227
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- M1822 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
702 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 334 | $167 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 233 | $115 |
| Critical Care, First 30-74 Minutes99291 | 104 | $202 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 18 | $8 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 13 | $68 |
Typical Medicare-allowed amounts for these services range $8–$202 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 97 | 96 |
| Ondansetron Hcl | 84 | 81 |
| Tramadol Hcl | 59 | 59 |
| Methylprednisolone | 56 | 55 |
| Prednisone | 50 | 48 |
| Celecoxib | 44 | 41 |
| Cephalexin | 43 | 42 |
| Methocarbamol | 36 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$387 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-03
- Last updated
- 2024-01-22
- Certified
- 2024-01-19
Frequently asked questions
- What is Gregory Keelen's NPI number?
- Gregory Keelen's National Provider Identifier (NPI) is 1811905227, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Keelen's specialty?
- Gregory Keelen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Keelen located?
- Gregory Keelen's practice location on file with NPPES is 5016 US-75, Denison, TX 75020.
- What is Gregory Keelen's phone number?
- The practice phone number listed in the NPPES registry for Gregory Keelen is (214) 433-9602.
- Does Gregory Keelen accept Medicare?
- Gregory Keelen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Keelen's NPI active?
- Yes — Gregory Keelen's NPI (1811905227) is active in the NPPES registry as of the last update on 2024-01-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.