William Klas, M.D.
NPI 1427059971 · Family Medicine Physician · Placerville, CA
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Klas, M.D. is a Family Medicine Physician provider in Placerville, CA (NPI 1427059971).
Provider details
- NPI number
- 1427059971
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G65747 (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
20 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 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 101 | 22 |
| Atorvastatin Calcium | 76 | 34 |
| Lisinopril | 68 | 32 |
| Amlodipine Besylate | 63 | 20 |
| Trazodone Hcl | 61 | 23 |
| Gabapentin | 57 | 23 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-09
- Last updated
- 2016-01-12
Frequently asked questions
- What is William Klas's NPI number?
- William Klas's National Provider Identifier (NPI) is 1427059971, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Klas's specialty?
- William Klas is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Klas located?
- William Klas's practice location on file with NPPES is 1095 Marshall Way, Placerville, CA 95667-5722.
- What is William Klas's phone number?
- The practice phone number listed in the NPPES registry for William Klas is (530) 626-2920.
- Does William Klas accept Medicare?
- William Klas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Klas's NPI active?
- Yes — William Klas's NPI (1427059971) is active in the NPPES registry as of the last update on 2016-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.