Patrick Grierson, MD
NPI 1720492192 · Medical Oncology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patrick Grierson, MD is a Medical Oncology Physician provider in Saint Louis, MO (NPI 1720492192).
Provider details
- NPI number
- 1720492192
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2017020379 (MO)
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 tenure25% of score
12 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
852 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 | 225 | $123 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 109 | $87 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 91 | $121 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 81 | $27 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 77 | $14 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 43 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prochlorperazine Maleate | 139 | 81 |
| Dexamethasone | 134 | 62 |
| Ondansetron Hcl | 110 | 70 |
| Gabapentin | 84 | 16 |
| Loperamide Hclbrand: Loperamide | 67 | 36 |
| Apixabanbrand: Eliquis | 62 | 14 |
| Oxycodone Hcl | 60 | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,214 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
- 2014-06-13
- Last updated
- 2025-04-17
Frequently asked questions
- What is Patrick Grierson's NPI number?
- Patrick Grierson's National Provider Identifier (NPI) is 1720492192, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick Grierson's specialty?
- Patrick Grierson is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Patrick Grierson located?
- Patrick Grierson's practice location on file with NPPES is 10 Barnes West Dr, Saint Louis, MO 63141-6287.
- What is Patrick Grierson's phone number?
- The practice phone number listed in the NPPES registry for Patrick Grierson is (800) 647-2098.
- Does Patrick Grierson accept Medicare?
- Patrick Grierson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patrick Grierson's NPI active?
- Yes — Patrick Grierson's NPI (1720492192) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.