Maria Cristina De Souza, M.D.
NPI 1689602393 · Internal Medicine Physician · Williston, ND
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maria Cristina De Souza, M.D. is a Internal Medicine Physician provider in Williston, ND (NPI 1689602393).
Provider details
- NPI number
- 1689602393
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 24132 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
55 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 29 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 14 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 12 | $10 |
Typical Medicare-allowed amounts for these services range $8–$10 (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 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Amlodipine Besylate | 24 |
| Chlorthalidone | 15 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (4)
- 1851 N Gemini DrFlagstaff, AZ 86001-1607Phone: (928) 266-0118
- 2920 N 4th StFlagstaff, AZ 86004-1816Phone: (928) 522-9400Fax: (928) 774-4808
- 15333 N Pima Rd Ste 305Scottsdale, AZ 85260-2717Phone: (866) 949-0108
- 2305 37th Ave SwMinot, ND 58701-7669Phone: (701) 418-8000
Registry dates
- Enumerated
- 2006-06-29
- Last updated
- 2025-09-23
- Certified
- 2025-09-23
Frequently asked questions
- What is Maria Cristina De Souza's NPI number?
- Maria Cristina De Souza's National Provider Identifier (NPI) is 1689602393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maria Cristina De Souza's specialty?
- Maria Cristina De Souza is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Maria Cristina De Souza located?
- Maria Cristina De Souza's practice location on file with NPPES is 1321 W Dakota Pkwy, Williston, ND 58801-3807.
- What is Maria Cristina De Souza's phone number?
- The practice phone number listed in the NPPES registry for Maria Cristina De Souza is (701) 572-7711.
- Does Maria Cristina De Souza accept Medicare?
- Maria Cristina De Souza is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maria Cristina De Souza's NPI active?
- Yes — Maria Cristina De Souza's NPI (1689602393) is active in the NPPES registry as of the last update on 2025-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.