Stephen Kenton Waterbrook, M.D.
Surgery Physician · Grass Valley, CA
Stephen Kenton Waterbrook, M.D. is a surgery physician with a practice address in Grass Valley, California, and NPI 1558564872, issued on Jun 6, 2007. Check the license (California A94355, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Kenton Waterbrook
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- A94355 CA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Catherine LN, Grass Valley, CA 95945
- Phone
- (530) 272-2257
- Enumerated
- Jun 6, 2007
- Record last updated
- Nov 15, 2022
- Fax
- (530) 272-6977
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 150 Catherine LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stephen Kenton Waterbrook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A94355Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 30 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Stephen Kenton Waterbrook among 3,118 surgery physician records in California
Stephen Kenton Waterbrook, M.D. is one of 3,118 surgery physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 42% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in Grass Valley → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Thomas Boyle, MDGrass Valley, CA 959451467483966
- Asfandyar Khan, M.DGrass Valley, CA 959451750765392
- Nelson Maldonado, M.D.Grass Valley, CA 959451508921305
- Robert Michelin, M.D.Grass Valley, CA 959451154478055
- Minor Ward, M.D.Grass Valley, CA 959451487696464
- Federico Gregorio, M.D.Colusa, CA 959321437184876
- Lawrence Highman, MDColusa, CA 959321316992068
- Marcella McLarty, M.D.Chico, CA 959281841295706
Common questions
What is Stephen Kenton Waterbrook, M.D.'s NPI number?
Stephen Kenton Waterbrook, M.D.'s National Provider Identifier (NPI) is 1558564872, issued on Jun 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Kenton Waterbrook, M.D. located?
The NPPES record lists a practice address at 150 Catherine LN, Grass Valley, CA, 95945. Phone: (530) 272-2257. Providers update this record themselves, so call before visiting.
How can I verify Stephen Kenton Waterbrook, M.D.'s license?
NPPES lists California license number A94355, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Stephen Kenton Waterbrook, M.D.'s MIPS final score?
The 2023 MIPS final score is 30 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.