William Marsh, M.D.
NPI 1659385441 · General Practice Physician · Cave Creek, AZ
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Marsh, M.D. is a General Practice Physician provider in Cave Creek, AZ (NPI 1659385441).
Provider details
- NPI number
- 1659385441
- Entity type
- Individual
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 13237 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ezetimibe | 68 | 30 |
| Atorvastatin Calcium | 56 | 24 |
| Levothyroxine Sodium | 53 | 25 |
| Losartan Potassium | 43 | 19 |
| Metoprolol Succinate | 35 | 16 |
| Amlodipine Besylate | 33 | 16 |
| Pravastatin Sodium | 29 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-28
- Last updated
- 2018-10-17
Frequently asked questions
- What is William Marsh's NPI number?
- William Marsh's National Provider Identifier (NPI) is 1659385441, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Marsh's specialty?
- William Marsh is listed in the NPPES registry with a primary specialty of General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is William Marsh located?
- William Marsh's practice location on file with NPPES is 30012 N Cave Creek Rd Ste 105, Cave Creek, AZ 85331-5833.
- What is William Marsh's phone number?
- The practice phone number listed in the NPPES registry for William Marsh is (480) 585-0880.
- Does William Marsh accept Medicare?
- William Marsh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Marsh's NPI active?
- Yes — William Marsh's NPI (1659385441) is active in the NPPES registry as of the last update on 2018-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.