Louis G. Christiansen, M.D.
Endocrinology, Diabetes & Metabolism Physician · San Diego, CA
Louis G. Christiansen, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in San Diego, California, and NPI 1639187743, issued on Aug 4, 2006. Check the license (California A75346, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Louis G. Christiansen
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- A75346 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Fir St, San Diego, CA 92101
- Phone
- (619) 446-1725
- Enumerated
- Aug 4, 2006
- Record last updated
- Jun 17, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (619) 446-1692
- Medicaid ID
- 00A753460 CA
- Medicare enrollment
- Enrolled (PECOS I20040901001480); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 300 Fir St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mahshid ChehrehraziPhysical Therapist1073231510
Verify Louis G. Christiansen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A75346Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,145 Medicare Part D claims for 329 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 54% of claims.
Most prescribed
- Levothyroxine Sodium303 claims
- Methimazole168 claims
- Lantus Solostar149 claims
- Humalog Kwikpen U-100125 claims
- Ozempic109 claims
- Rosuvastatin Calcium76 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Sharp Rees-Stealy Medical Group IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Louis G. Christiansen among 1,131 endocrinology, diabetes & metabolism physician records in California
Louis G. Christiansen, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1999 · median 2003 among the 779 with a school on file
- Record last updated2013 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in San Diego → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Lisa Strahm, M.D.San Diego, CA 921011952708075
- Julie Islam, M.D.San Diego, CA 921021750780516
- Suvesh Chandiok, MDSan Diego, CA 921031235112608
- Edward Chao, DOSan Diego, CA 921031932298122
- Wolfgang Dillman, M.D.San Diego, CA 921031386675445
- Chris Guerin, M.D.San Diego, CA 921031275648875
- Derek Mafong, M.D.San Diego, CA 921031699781633
- Karen McCowen, M.D.San Diego, CA 921031972541274
Common questions
What is Louis G. Christiansen, M.D.'s NPI number?
Louis G. Christiansen, M.D.'s National Provider Identifier (NPI) is 1639187743, issued on Aug 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Louis G. Christiansen, M.D. located?
The NPPES record lists a practice address at 300 Fir St, San Diego, CA, 92101. Phone: (619) 446-1725. Providers update this record themselves, so call before visiting.
How can I verify Louis G. Christiansen, M.D.'s license?
NPPES lists California license number A75346, 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 Louis G. Christiansen, M.D. prescribe under Medicare Part D?
In 2024, Louis G. Christiansen, M.D. had 2,145 Medicare Part D claims for 329 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Louis G. Christiansen, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. 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.