Darrin Friesen, M.D.
NPI 1699952465 · Specialist · Saint Louis, MO
Enrolled with Medicare as Order and Referring Only - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Darrin Friesen, M.D. is a Specialist provider in Saint Louis, MO (NPI 1699952465).
Provider details
- NPI number
- 1699952465
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 106376 (MO)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Lamotrigine | 76 |
| Fluoxetine Hcl | 65 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphet Er | 54 |
| Aripiprazole | 46 |
| Ziprasidone Hcl | 45 |
| Trazodone Hcl | 41 |
| Quetiapine Fumaratebrand: Quetiapine Fumarate Er | 39 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$711 across 39 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
- 2008-01-23
- Last updated
- 2008-01-23
Frequently asked questions
- What is Darrin Friesen's NPI number?
- Darrin Friesen's National Provider Identifier (NPI) is 1699952465, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Darrin Friesen's specialty?
- Darrin Friesen is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Darrin Friesen located?
- Darrin Friesen's practice location on file with NPPES is 1750 S Brentwood Blvd, Saint Louis, MO 63144-1315.
- What is Darrin Friesen's phone number?
- The practice phone number listed in the NPPES registry for Darrin Friesen is (314) 968-2111.
- Does Darrin Friesen accept Medicare?
- Darrin Friesen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Darrin Friesen's NPI active?
- Yes — Darrin Friesen's NPI (1699952465) is active in the NPPES registry as of the last update on 2008-01-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.