Gregory Trolley, M.D.
NPI 1609019652 · Neurology Physician · Houston, TX
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Trolley, M.D. is a Neurology Physician provider in Houston, TX (NPI 1609019652).
Provider details
- NPI number
- 1609019652
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- UNSURE (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
17 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
1,635 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,133 | $114 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 315 | $149 |
| Measurement of Brain Wave Activity (eeg), Awake and Drowsy95816 | 74 | $334 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 55 | $161 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 37 | $82 |
| Measurement of Brain Wave Activity (eeg), Awake and Asleep |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 71 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Donepezil Hcl | 1,559 | 497 |
| Memantine Hcl | 1,370 | 435 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 813 | 225 |
| Gabapentin | 806 | 288 |
| Levetiracetam | 693 | 208 |
| Topiramate | 355 | 114 |
| Pregabalin | 276 | 110 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,314 across 73 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
- 2009-04-07
- Last updated
- 2009-04-07
Frequently asked questions
- What is Gregory Trolley's NPI number?
- Gregory Trolley's National Provider Identifier (NPI) is 1609019652, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Trolley's specialty?
- Gregory Trolley is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Trolley located?
- Gregory Trolley's practice location on file with NPPES is 2002 Holcombe Blvd, Houston, TX 77030-4211.
- What is Gregory Trolley's phone number?
- The practice phone number listed in the NPPES registry for Gregory Trolley is (713) 791-1414.
- Does Gregory Trolley accept Medicare?
- Gregory Trolley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Trolley's NPI active?
- Yes — Gregory Trolley's NPI (1609019652) is active in the NPPES registry as of the last update on 2009-04-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.