Douglas Merkel, MD
NPI 1235156811 · Medical Oncology Physician · Evanston, IL
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Douglas Merkel, MD is a Medical Oncology Physician provider in Evanston, IL (NPI 1235156811).
Provider details
- NPI number
- 1235156811
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036065572 (IL)
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
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
1,805 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,299 | $69 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 252 | $37 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 210 | $102 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 26 | $141 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 18 | $83 |
Typical Medicare-allowed amounts for these services range $37–$141 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 715 | 194 |
| Letrozole | 450 | 135 |
| Tamoxifen Citrate | 126 | 39 |
| Exemestane | 96 | 24 |
| Ribociclib Succinatebrand: Kisqali | 74 | — |
| Palbociclibbrand: Ibrance | 67 | — |
| Ondansetron Hcl | 46 | 24 |
| Dexamethasone | 35 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2020-10-06
- Certified
- 2020-10-06
Frequently asked questions
- What is Douglas Merkel's NPI number?
- Douglas Merkel's National Provider Identifier (NPI) is 1235156811, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Douglas Merkel's specialty?
- Douglas Merkel is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Douglas Merkel located?
- Douglas Merkel's practice location on file with NPPES is 2650 Ridge Ave, Evanston, IL 60201.
- What is Douglas Merkel's phone number?
- The practice phone number listed in the NPPES registry for Douglas Merkel is (847) 570-2112.
- Does Douglas Merkel accept Medicare?
- Douglas Merkel is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Douglas Merkel's NPI active?
- Yes — Douglas Merkel's NPI (1235156811) is active in the NPPES registry as of the last update on 2020-10-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.