Deborah Treacy, M.D.
NPI 1558391524 · Emergency Medicine Physician · O Fallon, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Deborah Treacy, M.D. is a Emergency Medicine Physician provider in O Fallon, IL (NPI 1558391524).
Provider details
- NPI number
- 1558391524
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
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
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
606 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 371 | $181 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 105 | $125 |
| Electrocardiogram (ecg) 1 to 3 Leads With Review By Physician Only93042 | 87 | $7 |
| Critical Care, First 30-74 Minutes99291 | 43 | $216 |
Typical Medicare-allowed amounts for these services range $7–$216 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 40 | 37 |
| Cephalexin | 36 | 35 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 32 | 32 |
| Prednisone | 23 | 23 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 17 | 17 |
| Naproxen | 17 | 12 |
| Nitrofurantoin Monohyd/M-Cryst |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-04
- Last updated
- 2007-07-08
Frequently asked questions
- What is Deborah Treacy's NPI number?
- Deborah Treacy's National Provider Identifier (NPI) is 1558391524, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Deborah Treacy's specialty?
- Deborah Treacy is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Deborah Treacy located?
- Deborah Treacy's practice location on file with NPPES is 103 N Oak St, O Fallon, IL 62269-1165.
- What is Deborah Treacy's phone number?
- The practice phone number listed in the NPPES registry for Deborah Treacy is (618) 624-3368.
- Does Deborah Treacy accept Medicare?
- Deborah Treacy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Deborah Treacy's NPI active?
- Yes — Deborah Treacy's NPI (1558391524) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.