Karen Quirk, MD
NPI 1639363138 · Vascular Surgery Physician · Oxnard, CA
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Quirk, MD is a Vascular Surgery Physician provider in Oxnard, CA (NPI 1639363138).
Provider details
- NPI number
- 1639363138
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A102046 (CA)
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
18 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
1,514 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 | 350 | $136 |
| Strapping, Unna Boot29580 | 174 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 141 | $96 |
| Ultrasonic Guidance for Blood Vessel Access76937 | 130 | $41 |
| Injection of Chemical Agent Into Multiple Incompetent Veins of Leg36471 | 122 | $310 |
| Ultrasound Study of Arm Or Leg Veins With Compression and Maneuvers93970 | 100 | $203 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 61 | 12 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 57 | 17 |
| Atorvastatin Calcium | 49 | 15 |
| Lidocaine/Prilocainebrand: Lidocaine-Prilocaine | 30 | 13 |
| Cilostazol | 27 | — |
| Rivaroxabanbrand: Xarelto | 25 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,033 across 22 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
- 2007-08-28
- Last updated
- 2016-02-10
Frequently asked questions
- What is Karen Quirk's NPI number?
- Karen Quirk's National Provider Identifier (NPI) is 1639363138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Quirk's specialty?
- Karen Quirk is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Quirk located?
- Karen Quirk's practice location on file with NPPES is 2841 N Ventura Rd, Oxnard, CA 93036-2213.
- What is Karen Quirk's phone number?
- The practice phone number listed in the NPPES registry for Karen Quirk is (805) 983-6233.
- Does Karen Quirk accept Medicare?
- Karen Quirk is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Quirk's NPI active?
- Yes — Karen Quirk's NPI (1639363138) is active in the NPPES registry as of the last update on 2016-02-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.