Physician Profile
Unclaimed ProfileAbout MANAYAN
Rex Chang Manayan, M.D. practises general surgery in Ontario, CA. Rex is a 1991 graduate of Tufts University School of Medicine. Rex is also listed as specialising in surgery and vascular surgery.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Manayan's specialty?
Dr. Manayan is a general surgeon in Ontario, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “GENERAL SURGERY”.
NPI registry
Where can I find Dr. Manayan?
Dr. Manayan is listed at 3333 CONCOURS STE 100, Ontario, CA 91764. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Manayan?
The number on file is (909) 481-3242. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Manayan?
Dr. Manayan's National Provider Identifier is 1649278599. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Manayan's medical education?
Dr. Manayan attended Tufts University School of Medicine, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Manayan have?
Dr. Manayan has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Manayan known for?
According to Medicare billing data, Dr. Manayan performs procedures including chemical destruction of first incompetent vein of arm or leg using imaging guidance, injection of chemical agent into single incompetent vein of leg using ultrasound guidance and injection of chemical agent into multiple incompetent veins of leg; reads or performs imaging such as ultrasonic guidance for needle placement; provides treatments such as ultrasound study of one arm or leg veins with compression and maneuvers and ultrasound study of arm or leg veins with compression and maneuvers, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Manayan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Manayan. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (909) 481-3242
- Email not available
Practice Locations
3333 CONCOURS STE 100
Ontario, CA 91764
Procedures Most Often Billed to Medicare
2,142 services · 733 patients · 8 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Chemical destruction of first incompetent vein of arm or leg using imaging guidance | Procedure | 36482 |
469 |
| Injection of chemical agent into single incompetent vein of leg using ultrasound guidance | Procedure | 36465 |
182 |
| Injection of chemical agent into multiple incompetent veins of leg | Procedure | 36471 |
109 |
| Ultrasonic guidance for needle placement | Imaging | 76942 |
109 |
| Ultrasound study of one arm or leg veins with compression and maneuvers | Treatment | 93971 |
420 |
| Ultrasound study of arm or leg veins with compression and maneuvers | Treatment | 93970 |
204 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
545 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
104 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other general surgeons in Ontario 2
Same specialty, same city.
Trained at Tufts University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1991 at Tufts University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Chemical destruction of first incompetent vein of arm or leg using imaging guidance 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.