Allen Williams, MD
NPI 1073601324 · Internal Medicine Physician · Rockford, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Allen Williams, MD is a Internal Medicine Physician provider in Rockford, IL (NPI 1073601324).
Provider details
- NPI number
- 1073601324
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036103011 (IL)
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
19 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
1,943 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 | 533 | $120 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 491 | $16 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 459 | $9 |
| Administration of Influenza Virus VaccineG0008 | 80 | $31 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $87 |
| Admn Sarscov2 Vacc 1 Dose |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 162 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 1,093 | 290 |
| Amlodipine Besylate | 640 | 164 |
| Levothyroxine Sodium | 594 | 145 |
| Losartan Potassium | 398 | 108 |
| Lisinopril | 354 | 100 |
| Metformin Hcl | 344 | 95 |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-11
- Last updated
- 2021-02-18
- Certified
- 2021-02-18
Frequently asked questions
- What is Allen Williams's NPI number?
- Allen Williams's National Provider Identifier (NPI) is 1073601324, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Allen Williams's specialty?
- Allen Williams is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Allen Williams located?
- Allen Williams's practice location on file with NPPES is 3505 N. Bell School Rd., Rockford, IL 61114.
- What is Allen Williams's phone number?
- The practice phone number listed in the NPPES registry for Allen Williams is (779) 696-0300.
- Does Allen Williams accept Medicare?
- Allen Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Allen Williams's NPI active?
- Yes — Allen Williams's NPI (1073601324) is active in the NPPES registry as of the last update on 2021-02-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.