Gregory Simpson, O.D.
NPI 1912922378 · Optometrist · Bullhead City, AZ
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Simpson, O.D. is a Optometrist provider in Bullhead City, AZ (NPI 1912922378).
Provider details
- NPI number
- 1912922378
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 1542 (AZ)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,005 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Complete Exam of Visual System92014 | 245 | $126 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 150 | $91 |
| Imaging of Retina92134 | 133 | $40 |
| Imaging of Optic Nerve92133 | 92 | $36 |
| Exam of Visual Field With Extended Testing92083 | 78 | $63 |
| New Patient Complete Exam of Visual System92004 | 75 | $147 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 631 | 173 |
| Timolol Maleate | 226 | 86 |
| Prednisolone Acetate | 96 | 71 |
| Brimonidine Tartrate | 84 | 29 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 36 | — |
| Dorzolamide Hcl | 34 | 13 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 26 | 20 |
Practice location
Mailing address
Additional practice locations (1)
- 3953 N Stockton Hill RdKingman, AZ 86409-3001Phone: (928) 757-3330
Registry dates
- Enumerated
- 2006-07-13
- Last updated
- 2018-06-19
Frequently asked questions
- What is Gregory Simpson's NPI number?
- Gregory Simpson's National Provider Identifier (NPI) is 1912922378, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Simpson's specialty?
- Gregory Simpson is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Gregory Simpson located?
- Gregory Simpson's practice location on file with NPPES is 1800 Hway 95, Bullhead City, AZ 86442.
- What is Gregory Simpson's phone number?
- The practice phone number listed in the NPPES registry for Gregory Simpson is (928) 763-8443.
- Does Gregory Simpson accept Medicare?
- Gregory Simpson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Simpson's NPI active?
- Yes — Gregory Simpson's NPI (1912922378) is active in the NPPES registry as of the last update on 2018-06-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.