Gwynn Patterson, MD
NPI 1134111941 · Obstetrics & Gynecology Physician · Sierra Vista, AZ
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gwynn Patterson, MD is a Obstetrics & Gynecology Physician provider in Sierra Vista, AZ (NPI 1134111941).
Provider details
- NPI number
- 1134111941
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 14904 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
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
101 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 Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 51 | $88 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 26 | $124 |
| Cervical Or Vaginal Cancer Screening; Pelvic and Clinical Breast ExaminationG0101 | 24 | $37 |
Typical Medicare-allowed amounts for these services range $37–$124 (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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Estradiol | 58 | 44 |
| Estradiolbrand: Imvexxy | 29 | — |
| Estradiolbrand: Estradiol (twice Weekly) | 27 | — |
| Progesterone, Micronizedbrand: Progesterone | 22 | — |
| Ondansetron Hcl | 13 | — |
| Imipramine Hcl | 12 | — |
| Triamcinolone Acetonide | 12 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-17
- Last updated
- 2026-01-29
- Certified
- 2026-01-29
Frequently asked questions
- What is Gwynn Patterson's NPI number?
- Gwynn Patterson's National Provider Identifier (NPI) is 1134111941, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gwynn Patterson's specialty?
- Gwynn Patterson is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Gwynn Patterson located?
- Gwynn Patterson's practice location on file with NPPES is 4990 E Mediterranean Dr, Sierra Vista, AZ 85635-2494.
- What is Gwynn Patterson's phone number?
- The practice phone number listed in the NPPES registry for Gwynn Patterson is (520) 417-2229.
- Does Gwynn Patterson accept Medicare?
- Gwynn Patterson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gwynn Patterson's NPI active?
- Yes — Gwynn Patterson's NPI (1134111941) is active in the NPPES registry as of the last update on 2026-01-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.