Cheyenne Sonntag, MD
NPI 1104244144 · Surgery Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cheyenne Sonntag, MD is a Surgery Physician provider in Palo Alto, CA (NPI 1104244144).
Provider details
- NPI number
- 1104244144
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A171743 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 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
437 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 137 | $234 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 91 | $88 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 89 | $55 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 53 | $146 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 33 | $92 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$7 across 1 record (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
- 2014-04-05
- Last updated
- 2024-04-27
- Certified
- 2024-04-27
Frequently asked questions
- What is Cheyenne Sonntag's NPI number?
- Cheyenne Sonntag's National Provider Identifier (NPI) is 1104244144, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cheyenne Sonntag's specialty?
- Cheyenne Sonntag is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Cheyenne Sonntag located?
- Cheyenne Sonntag's practice location on file with NPPES is 300 Pasteur Dr, Palo Alto, CA 94305-2200.
- What is Cheyenne Sonntag's phone number?
- The practice phone number listed in the NPPES registry for Cheyenne Sonntag is (650) 723-4000.
- Does Cheyenne Sonntag accept Medicare?
- Cheyenne Sonntag is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cheyenne Sonntag's NPI active?
- Yes — Cheyenne Sonntag's NPI (1104244144) is active in the NPPES registry as of the last update on 2024-04-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.