Denis O'Brien, MD
NPI 1427053339 · Orthopaedic Surgery Physician · Olney, MD
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Denis O'Brien, MD is a Orthopaedic Surgery Physician provider in Olney, MD (NPI 1427053339).
Provider details
- NPI number
- 1427053339
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- D0042989 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,794 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 799 | $141 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 658 | $81 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 591 | $100 |
| X-Ray of Knee, 1-2 Views73560 | 430 | $39 |
| Aspiration And/Or Injection of Fluid Large Joint Using Ultrasound Guidance20611 | 231 | $110 |
| X-Ray of Shoulder, Minimum of 2 Views73030 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 217 | 159 |
| Cyclobenzaprine Hcl | 186 | 153 |
| Methylprednisolone | 184 | 166 |
| Tramadol Hcl | 52 | 40 |
| Oxycodone Hcl | 40 | 31 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 33 | 32 |
| Cephalexin | 31 | 25 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$259 across 4 records (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
Registry dates
- Enumerated
- 2005-06-16
- Last updated
- 2009-11-23
Frequently asked questions
- What is Denis O'Brien's NPI number?
- Denis O'Brien's National Provider Identifier (NPI) is 1427053339, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Denis O'Brien's specialty?
- Denis O'Brien is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Denis O'Brien located?
- Denis O'Brien's practice location on file with NPPES is 3414 Olandwood Ct, Olney, MD 20832-1384.
- What is Denis O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Denis O'Brien is (301) 774-0500.
- Does Denis O'Brien accept Medicare?
- Denis O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Denis O'Brien's NPI active?
- Yes — Denis O'Brien's NPI (1427053339) is active in the NPPES registry as of the last update on 2009-11-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.