Matthew Obrien, MD
NPI 1306900378 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Obrien, MD is a Internal Medicine Physician provider in Chicago, IL (NPI 1306900378).
Provider details
- NPI number
- 1306900378
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MT183707 (PA)
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
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
253 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 79 | $135 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 68 | $17 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 37 | $136 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 24 | $193 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 24 | $139 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 119 | 37 |
| Lisinopril | 73 | 20 |
| Amlodipine Besylate | 56 | 20 |
| Gabapentin | 54 | 15 |
| Semaglutidebrand: Ozempic | 41 | — |
| Tamsulosin Hcl | 37 | 12 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-21
- Last updated
- 2014-07-10
Frequently asked questions
- What is Matthew Obrien's NPI number?
- Matthew Obrien's National Provider Identifier (NPI) is 1306900378, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Obrien's specialty?
- Matthew Obrien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Obrien located?
- Matthew Obrien's practice location on file with NPPES is 675 N. St. Clair, Chicago, IL 60611.
- What is Matthew Obrien's phone number?
- The practice phone number listed in the NPPES registry for Matthew Obrien is (312) 695-8630.
- Does Matthew Obrien accept Medicare?
- Matthew Obrien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Obrien's NPI active?
- Yes — Matthew Obrien's NPI (1306900378) is active in the NPPES registry as of the last update on 2014-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.