Charles Metzger, MD
NPI 1881778959 · Internal Medicine Physician · Petaluma, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Metzger, MD is a Internal Medicine Physician provider in Petaluma, CA (NPI 1881778959).
Provider details
- NPI number
- 1881778959
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A68121 (CA)
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 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 829 | 273 |
| Amlodipine Besylate | 302 | 98 |
| Tamsulosin Hcl | 261 | 85 |
| Lisinopril | 260 | 83 |
| Levothyroxine Sodium | 237 | 74 |
| Losartan Potassium | 214 | 79 |
| Hydrocodone/Acetaminophen |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2021-12-06
Frequently asked questions
- What is Charles Metzger's NPI number?
- Charles Metzger's National Provider Identifier (NPI) is 1881778959, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Metzger's specialty?
- Charles Metzger is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Metzger located?
- Charles Metzger's practice location on file with NPPES is 3900 Lakeville Hwy, Petaluma, CA 94954-5698.
- What is Charles Metzger's phone number?
- The practice phone number listed in the NPPES registry for Charles Metzger is (707) 765-3900.
- Does Charles Metzger accept Medicare?
- Charles Metzger is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Metzger's NPI active?
- Yes — Charles Metzger's NPI (1881778959) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.