Glenda Williams, M.D.
NPI 1639379605 · Internal Medicine Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Glenda Williams, M.D. is a Internal Medicine Physician provider in Phoenix, AZ (NPI 1639379605).
Provider details
- NPI number
- 1639379605
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 81250 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 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
13 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 13 | $124 |
Typical Medicare-allowed amounts for these services range $124–$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 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 162 | 62 |
| Losartan Potassium | 149 | 52 |
| Rosuvastatin Calcium | 96 | 44 |
| Levothyroxine Sodium | 86 | 28 |
| Amlodipine Besylate | 71 | 30 |
| Tamsulosin Hcl | 67 | 26 |
| Albuterol Sulfate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-19
- Last updated
- 2023-01-19
- Certified
- 2023-01-19
Frequently asked questions
- What is Glenda Williams's NPI number?
- Glenda Williams's National Provider Identifier (NPI) is 1639379605, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Glenda Williams's specialty?
- Glenda Williams is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Glenda Williams located?
- Glenda Williams's practice location on file with NPPES is 8913 N 19th Ave, Phoenix, AZ 85021-4206.
- What is Glenda Williams's phone number?
- The practice phone number listed in the NPPES registry for Glenda Williams is (602) 858-4361.
- Does Glenda Williams accept Medicare?
- Glenda Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Glenda Williams's NPI active?
- Yes — Glenda Williams's NPI (1639379605) is active in the NPPES registry as of the last update on 2023-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.