Karen S. Loper, M.D.
Pediatrics Physician · San Diego, CA
Karen S. Loper, M.D. is a pediatrics physician with a practice address in San Diego, California, and NPI 1619908936, issued on Jul 5, 2006. Check the license (California G76438, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen S. Loper
- Credential
- M.D.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- G76438 CA
Self-reported in NPPES; status is on the state search - Practice location
- 550 Washington St Ste 300, San Diego, CA 92103
- Phone
- (619) 297-5437
- Enumerated
- Jul 5, 2006
- Record last updated
- Apr 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (619) 243-0722
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 550 Washington St Ste 300
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Giguere, D.O.Pediatrics Physician1649657487
- Blanca Gutierrez, M.D.Pediatrics Physician1326543984
- Alicia Knight, LMFTMarriage & Family Therapist1871192955
- Alisa Lawrie, M.D.Pediatrics Physician1407847908
- Tiffany Sena, DNPNurse Practitioner1710539523
- Debra Singer, M.D.Pediatrics Physician1518962190
Verify Karen S. Loper in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G76438Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $139.01
8 payments; by number, the most common kind was food and beverage; the largest payer was Cranial Technologies, Inc. The 21,580 providers of this specialty with any payment received $842.05 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.
Karen S. Loper among 9,272 pediatrics physician records in California
Karen S. Loper, M.D. is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 56% newer
- In a Medicare fileYes · 31% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2020 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatrics Physician providers in California
There are 9,272 pediatrics physician records in California.
All 9,272 in California → Every provider in San Diego → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Denise Brownlee, MDSan Diego, CA 921031073547477
- Jenny Clifford, M.D.San Diego, CA 921031699705806
- Bertha Gee-Lew, M.D.San Diego, CA 921031376645978
- Nicole Gorton, MDSan Diego, CA 921031356371421
- Eustratia Hubbard, MDSan Diego, CA 921031790743185
- Alisa Lawrie, M.D.San Diego, CA 921031407847908
- Michelle Leff, MDSan Diego, CA 921031053334292
- Jamie Lien, M.D.San Diego, CA 921031609880723
Common questions
What is Karen S. Loper, M.D.'s NPI number?
Karen S. Loper, M.D.'s National Provider Identifier (NPI) is 1619908936, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen S. Loper, M.D. located?
The NPPES record lists a practice address at 550 Washington St Ste 300, San Diego, CA, 92103. Phone: (619) 297-5437. Providers update this record themselves, so call before visiting.
How can I verify Karen S. Loper, M.D.'s license?
NPPES lists California license number G76438, 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.
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.