Marian Louis, MD
NPI 1457491144 · Psychiatry Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marian Louis, MD is a Psychiatry Physician provider in Sacramento, CA (NPI 1457491144).
Provider details
- NPI number
- 1457491144
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 155532 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
76 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 | 76 | $135 |
Typical Medicare-allowed amounts for these services range $135–$135 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Aripiprazole | 85 | 13 |
| Aripiprazolebrand: Abilify Maintena | 61 | — |
| Sertraline Hcl | 60 | 13 |
| Quetiapine Fumarate | 55 | 14 |
| Trazodone Hcl | 50 | 15 |
| Gabapentin | 46 | 12 |
| Buspirone Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-08
- Last updated
- 2021-06-02
- Certified
- 2021-06-02
Frequently asked questions
- What is Marian Louis's NPI number?
- Marian Louis's National Provider Identifier (NPI) is 1457491144, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marian Louis's specialty?
- Marian Louis is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Marian Louis located?
- Marian Louis's practice location on file with NPPES is 650 Howe Ave Bldg 400-B, Sacramento, CA 95825-4731.
- What is Marian Louis's phone number?
- The practice phone number listed in the NPPES registry for Marian Louis is (916) 993-4131.
- Does Marian Louis accept Medicare?
- Marian Louis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marian Louis's NPI active?
- Yes — Marian Louis's NPI (1457491144) is active in the NPPES registry as of the last update on 2021-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.