Mark Anthony Sy, MD
NPI 1609309905 · Pediatric Anesthesiology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Anthony Sy, MD is a Pediatric Anesthesiology Physician provider in Los Angeles, CA (NPI 1609309905).
Provider details
- NPI number
- 1609309905
- Entity type
- Individual
- Primary specialty
- Pediatric Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A171500 (CA)
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
9 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
44 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) |
|---|---|---|
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 30 | $132 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 14 | $134 |
Typical Medicare-allowed amounts for these services range $132–$134 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-04
- Last updated
- 2023-09-26
- Certified
- 2023-07-02
Frequently asked questions
- What is Mark Anthony Sy's NPI number?
- Mark Anthony Sy's National Provider Identifier (NPI) is 1609309905, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Anthony Sy's specialty?
- Mark Anthony Sy is listed in the NPPES registry with a primary specialty of Pediatric Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Anthony Sy located?
- Mark Anthony Sy's practice location on file with NPPES is 4867 W Sunset Blvd, Los Angeles, CA 90027-5969.
- What is Mark Anthony Sy's phone number?
- The practice phone number listed in the NPPES registry for Mark Anthony Sy is (323) 783-4011.
- Does Mark Anthony Sy accept Medicare?
- Mark Anthony Sy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Anthony Sy's NPI active?
- Yes — Mark Anthony Sy's NPI (1609309905) is active in the NPPES registry as of the last update on 2023-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.