Troy Shaffer, D.O.
NPI 1285665661 · Emergency Medicine Physician · Mchenry, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Troy Shaffer, D.O. is a Emergency Medicine Physician provider in Mchenry, IL (NPI 1285665661).
Provider details
- NPI number
- 1285665661
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 036095672 (IL)
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
317 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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 114 | $123 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 93 | $178 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 39 | $71 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 31 | $66 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 20 | $85 |
| Critical Care, First 30-74 Minutes99291 | 20 |
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 |
|---|---|---|
| Prednisone | 36 | 36 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 28 | 27 |
| Azithromycin | 27 | 26 |
| Doxycycline Hyclate | 23 | 22 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 21 | 20 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 19 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$122 across 1 record (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
Additional practice locations (3)
- 1045 W Stephenson StFreeport, IL 61032-4864Phone: (815) 599-6000Fax: (815) 599-7974
- 2400 N Rockton AveEr DeptRockford, IL 61103-3655Phone: (815) 971-5000Fax: (815) 968-0360
- 8201 E Riverside BlvdRockford, IL 61114-2300Phone: (815) 971-3333Fax: (815) 971-0916
Registry dates
- Enumerated
- 2006-07-05
- Last updated
- 2026-04-03
- Certified
- 2026-04-03
Frequently asked questions
- What is Troy Shaffer's NPI number?
- Troy Shaffer's National Provider Identifier (NPI) is 1285665661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Troy Shaffer's specialty?
- Troy Shaffer is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Troy Shaffer located?
- Troy Shaffer's practice location on file with NPPES is 4201 W Medical Center Dr, Mchenry, IL 60050-8409.
- What is Troy Shaffer's phone number?
- The practice phone number listed in the NPPES registry for Troy Shaffer is (815) 338-6600.
- Does Troy Shaffer accept Medicare?
- Troy Shaffer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Troy Shaffer's NPI active?
- Yes — Troy Shaffer's NPI (1285665661) is active in the NPPES registry as of the last update on 2026-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.