Timothy Darnauer, DO
NPI 1659640092 · Surgical Critical Care Physician · Reston, VA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Darnauer, DO is a Surgical Critical Care Physician provider in Reston, VA (NPI 1659640092).
Provider details
- NPI number
- 1659640092
- Entity type
- Individual
- Primary specialty
- Surgical Critical Care PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 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
214 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 109 | $200 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 22 | $73 |
| Insertion of Non-Tunneled Central Venous Tube for Infusion (5 Years Or Older)36556 | 20 | $76 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 20 | $124 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 16 | $113 |
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-12-14
- Last updated
- 2020-12-07
- Certified
- 2020-12-07
Frequently asked questions
- What is Timothy Darnauer's NPI number?
- Timothy Darnauer's National Provider Identifier (NPI) is 1659640092, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Darnauer's specialty?
- Timothy Darnauer is listed in the NPPES registry with a primary specialty of Surgical Critical Care Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Darnauer located?
- Timothy Darnauer's practice location on file with NPPES is 1850 Town Center Pkwy, Reston, VA 20190-3204.
- What is Timothy Darnauer's phone number?
- The practice phone number listed in the NPPES registry for Timothy Darnauer is (703) 689-9000.
- Does Timothy Darnauer accept Medicare?
- Timothy Darnauer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Darnauer's NPI active?
- Yes — Timothy Darnauer's NPI (1659640092) is active in the NPPES registry as of the last update on 2020-12-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.