Gregory Middleton, MD
NPI 1104891290 · Rheumatology Physician · La Jolla, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Middleton, MD is a Rheumatology Physician provider in La Jolla, CA (NPI 1104891290).
Provider details
- NPI number
- 1104891290
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 9639 (NV)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,100 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) |
|---|---|---|
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 767 | $56 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 360 | $83 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 285 | $67 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 145 | $36 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 107 | $99 |
| Injection Into Tendon Or Ligament |
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 |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 177 | 41 |
| Prednisone | 172 | 29 |
| Allopurinol | 105 | 23 |
| Hydroxychloroquine Sulfate | 68 | 12 |
| Leflunomide | 58 | 15 |
| Colchicine | 47 | 19 |
| Abataceptbrand: Orencia Clickject | 27 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-22
- Last updated
- 2010-03-28
Frequently asked questions
- What is Gregory Middleton's NPI number?
- Gregory Middleton's National Provider Identifier (NPI) is 1104891290, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Middleton's specialty?
- Gregory Middleton is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Middleton located?
- Gregory Middleton's practice location on file with NPPES is 9350 Campus Point Dr, La Jolla, CA 92037-1300.
- What is Gregory Middleton's phone number?
- The practice phone number listed in the NPPES registry for Gregory Middleton is (858) 657-8200.
- Does Gregory Middleton accept Medicare?
- Gregory Middleton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Middleton's NPI active?
- Yes — Gregory Middleton's NPI (1104891290) is active in the NPPES registry as of the last update on 2010-03-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.