Louis Christiansen, M.D.
NPI 1639187743 · Endocrinology, Diabetes & Metabolism Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Louis Christiansen, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in San Diego, CA (NPI 1639187743).
Provider details
- NPI number
- 1639187743
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A75346 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
278 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 107 | $137 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 53 | $98 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 34 | $116 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 19 | $16 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 19 | $61 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 38 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 303 | 83 |
| Methimazole | 168 | 34 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 149 | 39 |
| Insulin Lisprobrand: Humalog Kwikpen U-100 | 125 | 35 |
| Semaglutidebrand: Ozempic | 109 | 30 |
| Rosuvastatin Calcium | 76 | 29 |
| Pen Needle, Diabetic |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-04
- Last updated
- 2013-06-17
Frequently asked questions
- What is Louis Christiansen's NPI number?
- Louis Christiansen's National Provider Identifier (NPI) is 1639187743, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Louis Christiansen's specialty?
- Louis Christiansen is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Louis Christiansen located?
- Louis Christiansen's practice location on file with NPPES is 300 Fir St, San Diego, CA 92101-2327.
- What is Louis Christiansen's phone number?
- The practice phone number listed in the NPPES registry for Louis Christiansen is (619) 446-1725.
- Does Louis Christiansen accept Medicare?
- Louis Christiansen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Louis Christiansen's NPI active?
- Yes — Louis Christiansen's NPI (1639187743) is active in the NPPES registry as of the last update on 2013-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.