Mariana Marrero Castillo, M.D.
NPI 1366894859 · Internal Medicine Physician · Shreveport, LA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariana Marrero Castillo, M.D. is a Internal Medicine Physician provider in Shreveport, LA (NPI 1366894859).
Provider details
- NPI number
- 1366894859
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 328295 (LA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 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
225 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 179 | $91 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 17 | $62 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 16 | $91 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 13 | $126 |
Typical Medicare-allowed amounts for these services range $62–$126 (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 · 40 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 127 | 56 |
| Amlodipine Besylate | 114 | 49 |
| Pantoprazole Sodium | 61 | 25 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 53 | 17 |
| Nifedipinebrand: Nifedipine Er | 52 | 24 |
| Losartan Potassium | 46 | 25 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$86 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
- 2016-07-07
- Last updated
- 2022-12-28
- Certified
- 2022-12-28
Frequently asked questions
- What is Mariana Marrero Castillo's NPI number?
- Mariana Marrero Castillo's National Provider Identifier (NPI) is 1366894859, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariana Marrero Castillo's specialty?
- Mariana Marrero Castillo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mariana Marrero Castillo located?
- Mariana Marrero Castillo's practice location on file with NPPES is 1541 Kings Hwy, Shreveport, LA 71103-4228.
- What is Mariana Marrero Castillo's phone number?
- The practice phone number listed in the NPPES registry for Mariana Marrero Castillo is (318) 626-0000.
- Does Mariana Marrero Castillo accept Medicare?
- Mariana Marrero Castillo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariana Marrero Castillo's NPI active?
- Yes — Mariana Marrero Castillo's NPI (1366894859) is active in the NPPES registry as of the last update on 2022-12-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.