Mark Bostwick, MD
NPI 1487686614 · Internal Medicine Physician · Port Washington, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Bostwick, MD is a Internal Medicine Physician provider in Port Washington, WI (NPI 1487686614).
Provider details
- NPI number
- 1487686614
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 22296 (WI)
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
1,029 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 | 343 | $119 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 226 | $11 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 141 | $85 |
| Blood Test, Clotting Time85610 | 127 | $4 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 115 | $121 |
| Transitional Care Management Services for Problem of at Least Moderate Complexity99495 | 29 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 137 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 688 | 160 |
| Losartan Potassium | 419 | 105 |
| Amlodipine Besylate | 321 | 74 |
| Lisinopril | 283 | 65 |
| Levothyroxine Sodium | 273 | 61 |
| Omeprazole | 217 | 56 |
| Simvastatin | 215 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-07
- Last updated
- 2021-11-24
- Certified
- 2021-11-24
Frequently asked questions
- What is Mark Bostwick's NPI number?
- Mark Bostwick's National Provider Identifier (NPI) is 1487686614, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Bostwick's specialty?
- Mark Bostwick is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Bostwick located?
- Mark Bostwick's practice location on file with NPPES is 1777 W Grand Avenue, Port Washington, WI 53074.
- What is Mark Bostwick's phone number?
- The practice phone number listed in the NPPES registry for Mark Bostwick is (262) 284-3456.
- Does Mark Bostwick accept Medicare?
- Mark Bostwick is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Bostwick's NPI active?
- Yes — Mark Bostwick's NPI (1487686614) is active in the NPPES registry as of the last update on 2021-11-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.