William Ahrenholz, PA
NPI 1043968001 · Physician Assistant · Chicago, IL
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ahrenholz, PA is a Physician Assistant provider in Chicago, IL (NPI 1043968001).
Provider details
- NPI number
- 1043968001
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA
- Sex
- Male
- Sole proprietor
- Yes
- License
- 085009068 (IL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Buprenorphine Hcl/Naloxone Hclbrand: Buprenorphine-Naloxone | 63 | 25 |
| Atorvastatin Calcium | 34 | — |
| Amlodipine Besylate | 26 | 13 |
| Famotidine | 16 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 16 | — |
| Hydrochlorothiazide | 12 | — |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-03-17
- Last updated
- 2022-08-31
- Certified
- 2022-08-31
Frequently asked questions
- What is William Ahrenholz's NPI number?
- William Ahrenholz's National Provider Identifier (NPI) is 1043968001, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ahrenholz's specialty?
- William Ahrenholz is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Ahrenholz located?
- William Ahrenholz's practice location on file with NPPES is 3860 W Ogden Ave, Chicago, IL 60623-2460.
- What is William Ahrenholz's phone number?
- The practice phone number listed in the NPPES registry for William Ahrenholz is (872) 588-3000.
- Does William Ahrenholz accept Medicare?
- William Ahrenholz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ahrenholz's NPI active?
- Yes — William Ahrenholz's NPI (1043968001) is active in the NPPES registry as of the last update on 2022-08-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.