Neal Holzum, MD
NPI 1326011271 · Hospitalist Physician · O Fallon, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Neal Holzum, MD is a Hospitalist Physician provider in O Fallon, MO (NPI 1326011271).
Provider details
- NPI number
- 1326011271
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 110686 (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 tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,655 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 610 | $113 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 577 | $75 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 249 | $166 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 219 | $109 |
Typical Medicare-allowed amounts for these services range $75–$166 (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 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 62 | 60 |
| Pantoprazole Sodium | 42 | 42 |
| Metoprolol Tartrate | 38 | 34 |
| Furosemide | 38 | 35 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | 30 |
| Amlodipine Besylate | 30 | 28 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-10
- Last updated
- 2009-11-25
Frequently asked questions
- What is Neal Holzum's NPI number?
- Neal Holzum's National Provider Identifier (NPI) is 1326011271, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Neal Holzum's specialty?
- Neal Holzum is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Neal Holzum located?
- Neal Holzum's practice location on file with NPPES is 2 Progress Point Ct, O Fallon, MO 63368-2208.
- What is Neal Holzum's phone number?
- The practice phone number listed in the NPPES registry for Neal Holzum is (636) 236-9945.
- Does Neal Holzum accept Medicare?
- Neal Holzum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Neal Holzum's NPI active?
- Yes — Neal Holzum's NPI (1326011271) is active in the NPPES registry as of the last update on 2009-11-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.