Lionel Guillaume, M.D.
NPI 1619946001 · Specialist · Bossier City, LA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lionel Guillaume, M.D. is a Specialist provider in Bossier City, LA (NPI 1619946001).
Provider details
- NPI number
- 1619946001
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 017032 (LA)
Specialties & taxonomies
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
555 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 353 | $84 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 141 | $62 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 44 | $119 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 17 | $184 |
Typical Medicare-allowed amounts for these services range $62–$184 (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 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Divalproex Sodium | 275 | 57 |
| Trazodone Hcl | 250 | 43 |
| Quetiapine Fumarate | 231 | 37 |
| Risperidone | 217 | 38 |
| Aripiprazole | 168 | 30 |
| Doxepin Hcl | 158 | 26 |
| Olanzapine | 142 | 25 |
| Lithium Carbonate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$70 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-16
- Last updated
- 2021-09-17
- Certified
- 2021-09-17
Frequently asked questions
- What is Lionel Guillaume's NPI number?
- Lionel Guillaume's National Provider Identifier (NPI) is 1619946001, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lionel Guillaume's specialty?
- Lionel Guillaume is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Lionel Guillaume located?
- Lionel Guillaume's practice location on file with NPPES is 3018 Old Minden Rd, Bossier City, LA 71112-2495.
- What is Lionel Guillaume's phone number?
- The practice phone number listed in the NPPES registry for Lionel Guillaume is (318) 747-1665.
- Does Lionel Guillaume accept Medicare?
- Lionel Guillaume is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lionel Guillaume's NPI active?
- Yes — Lionel Guillaume's NPI (1619946001) is active in the NPPES registry as of the last update on 2021-09-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.