Karen Sonnenthal, N.P.
NPI 1942229463 · Nurse Practitioner · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Sonnenthal, N.P. is a Nurse Practitioner provider in Walnut Creek, CA (NPI 1942229463).
Provider details
- NPI number
- 1942229463
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- N.P.
- Sex
- Female
- Sole proprietor
- No
- License
- NP9432 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
903 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 299 | $91 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 213 | $116 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 104 | $86 |
| 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 | 91 | $16 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 54 | $64 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 94 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 223 | 69 |
| Rosuvastatin Calcium | 196 | 59 |
| Levothyroxine Sodium | 189 | 63 |
| Amlodipine Besylate | 171 | 51 |
| Lisinopril | 128 | 38 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 114 | 28 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$106 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2014-04-02
Frequently asked questions
- What is Karen Sonnenthal's NPI number?
- Karen Sonnenthal's National Provider Identifier (NPI) is 1942229463, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Sonnenthal's specialty?
- Karen Sonnenthal is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karen Sonnenthal located?
- Karen Sonnenthal's practice location on file with NPPES is 1450 Treat Blvd, Walnut Creek, CA 94597-2168.
- What is Karen Sonnenthal's phone number?
- The practice phone number listed in the NPPES registry for Karen Sonnenthal is (925) 296-9720.
- Does Karen Sonnenthal accept Medicare?
- Karen Sonnenthal is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Sonnenthal's NPI active?
- Yes — Karen Sonnenthal's NPI (1942229463) is active in the NPPES registry as of the last update on 2014-04-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.