William Barker, D.O.
NPI 1275554073 · Family Medicine Physician · Chesterfield, MI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Barker, D.O. is a Family Medicine Physician provider in Chesterfield, MI (NPI 1275554073).
Provider details
- NPI number
- 1275554073
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 5101013935 (MI)
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
473 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 | 174 | $122 |
| 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 | 150 | $16 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 52 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 40 | $86 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 39 | $129 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 135 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 267 | 49 |
| Omeprazole | 234 | 74 |
| Levothyroxine Sodium | 233 | 67 |
| Alprazolam | 231 | 53 |
| Atorvastatin Calcium | 212 | 69 |
| Losartan Potassium | 188 | 57 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-21
- Last updated
- 2021-03-11
- Certified
- 2021-03-11
Frequently asked questions
- What is William Barker's NPI number?
- William Barker's National Provider Identifier (NPI) is 1275554073, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Barker's specialty?
- William Barker is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Barker located?
- William Barker's practice location on file with NPPES is 30795 23 Mile Rd, Chesterfield, MI 48047-5720.
- What is William Barker's phone number?
- The practice phone number listed in the NPPES registry for William Barker is (586) 421-3150.
- Does William Barker accept Medicare?
- William Barker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Barker's NPI active?
- Yes — William Barker's NPI (1275554073) is active in the NPPES registry as of the last update on 2021-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.