John Flaks, D.O.
NPI 1366424939 · Anesthesiology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Flaks, D.O. is a Anesthesiology Physician provider in Baltimore, MD (NPI 1366424939).
Provider details
- NPI number
- 1366424939
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- H0059599 (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
20 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
104 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) |
|---|---|---|
| Anesthesia for Other Procedure on Top of Arm Bone and Shoulder Joint01630 | 20 | $154 |
| Injection of Anesthetic Agent And/Or Steroid Into Thigh Nerve (femoral Nerve)64447 | 17 | $61 |
| Anesthesia for Other Procedure on Lower Leg, Ankle, and Foot Bones01480 | 15 | $121 |
| Injection of Anesthetic Agent And/Or Steroid Into Arm Nerve Bundle (brachial Plexus)64415 | 15 | $71 |
| Anesthesia for Retinal Surgery00145 | 13 | $223 |
| Anesthesia for Procedure for Total Knee Joint Replacement01402 | 13 | $205 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$13 across 1 record (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
- 2005-11-18
- Last updated
- 2008-10-17
Frequently asked questions
- What is John Flaks's NPI number?
- John Flaks's National Provider Identifier (NPI) is 1366424939, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Flaks's specialty?
- John Flaks is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Flaks located?
- John Flaks's practice location on file with NPPES is 3001 S Hanover St, Baltimore, MD 21225-1233.
- What is John Flaks's phone number?
- The practice phone number listed in the NPPES registry for John Flaks is (410) 350-3341.
- Does John Flaks accept Medicare?
- John Flaks is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Flaks's NPI active?
- Yes — John Flaks's NPI (1366424939) is active in the NPPES registry as of the last update on 2008-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.