Kathryn Welty, MD
Nephrology Physician · Castro Valley, CA
Kathryn Welty, MD is a nephrology physician with a practice address in Castro Valley, California, and NPI 1740476761, issued on Sep 24, 2007. Check the license (California A126967, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathryn Welty
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License numbers
- A126967 CA
ML20008878 WA
Self-reported in NPPES; status is on the state search - Practice location
- 19850 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 881-1490
- Enumerated
- Sep 24, 2007
- Record last updated
- Mar 1, 2024
- Fax
- (510) 889-5806
- Medicare enrollment
- Enrolled (PECOS I20131106001046); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 19850 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gene-Yuan Chang, MDNephrology Physician1467731828
- Joann Dumas, FNPRegistered Nurse1902987126
- Isaac Ibrahimi, PA-CPhysician Assistant1588735849
- Vineetha Rangarajan, DONephrology Physician1295363752
Verify Kathryn Welty in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A126967Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average nephrology physician in 2024
1,393 Medicare Part D claims for 189 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate129 claims
- Losartan Potassium111 claims
- Hydralazine Hcl87 claims
- Farxiga84 claims
- Furosemide77 claims
- Lisinopril73 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $229.50
5 payments; by number, the most common kind was food and beverage; the largest payer was Calliditas Therapeutics US Inc. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- West Coast KidneySan Leandro, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathryn Welty among 1,468 nephrology physician records in California
Kathryn Welty, MD is one of 1,468 nephrology physician records with a practice address in California. 88% 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 52% of them.
- NPI issued2007 · 52% of these records are older, 35% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2007 · median 2001 among the 1,128 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Castro Valley → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Archana Aggarwal, M.D.Castro Valley 94546, CA 945461326024084
- Gene-Yuan Chang, MDCastro Valley, CA 945461467731828
- Vineetha Rangarajan, DOCastro Valley, CA 945461295363752
- Rahul Rishi, M.D.Castro Valley, CA 945461740243930
- Mario Bernaba, MDHayward, CA 945451205499506
- Neelam Bhalla, M.D.Hayward, CA 945451639118052
- Sarasa Kimata, M.D.Hayward, CA 945451477631232
- George Lai, M.D.Hayward, CA 945451043398803
Common questions
What is Kathryn Welty, MD's NPI number?
Kathryn Welty, MD's National Provider Identifier (NPI) is 1740476761, issued on Sep 24, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Welty, MD located?
The NPPES record lists a practice address at 19850 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 881-1490. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Welty, MD's license?
NPPES lists California license number A126967, 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.
How much does Kathryn Welty, MD prescribe under Medicare Part D?
In 2024, Kathryn Welty, MD had 1,393 Medicare Part D claims for 189 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
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.