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Edit this profileAt a glance
- 3333 Concours Ste 100, Ontario, CA 91764
About Dr. Manayan
Rex C. Manayan, M.D. practices general surgery in Ontario, CA. Rex is a 1991 graduate of Tufts University School of Medicine. Rex is also listed as specializing in surgery and vascular surgery. Medicare claims data shows Rex provided 2,142 services to 733 patients. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, chemical destruction of first incompetent vein of arm or leg using imaging guidance, and ultrasound study of one arm or leg veins with compression and maneuvers. The provider's National Provider Identifier (NPI) is 1649278599.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (909) 481-3242
- Email not available
Practice Locations
3333 CONCOURS STE 100
Ontario, CA 91764
Conditions Commonly Evaluated or Treated
Within General Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Appendicitis
- Breast cancer
- Gallstones
- Hernia
- Thyroid nodules
Anorectal
- Anal fissure
- Anal fistula
- Hemorrhoids
- Perianal abscess
- Rectal prolapse
Appendix, bowel, and emergency
- Diverticulitis
- Intra-abdominal abscess
- Mesenteric ischemia
- Peritonitis
Gallbladder and biliary
- Acute gallbladder inflammation
- Biliary dyskinesia
Hernia and abdominal wall
- Belly-button hernia
- Femoral hernia
- Groin hernia
- Hiatal hernia
- Incisional hernia
- Ventral hernia
Skin and soft tissue
- Epidermoid cyst
- Hidradenitis suppurativa
- Lipoma
- Skin and soft-tissue abscess
- Soft-tissue mass
Abdominal
- Enlarged spleen
Abdominal wall
Breast
- Benign breast disease
- Breast abscess
- Gynecomastia
Colorectal
- Pilonidal cyst
Digestive
- Acid reflux
- Acute pancreatitis
- Bleeding Stomach Ulcer
- Bowel Fistula
- Gastroparesis
- Swallowing difficulties
Emergency surgery
- Perforated bowel
Endocrine
- Adrenal gland tumor
- Hyperparathyroidism
- Thyroid cancer
Gastrointestinal
- Bowel obstruction
Hernia
- Diaphragmatic hernia
- Sports Hernia
- Strangulated Hernia
Infections
- Flesh-Eating Infection
Lymphatic
- Swollen Lymph Nodes
Oncology
- Colon cancer
- Neuroendocrine Tumors
Procedures & services
Most searched procedures
- Appendectomy
- Breast biopsy
- Gallbladder surgery
- Hernia repair surgery
- Lumpectomy
Bowel and emergency abdominal
- Colon resection
- Exploratory laparoscopy
- Exploratory laparotomy
- Repair of perforated peptic ulcer
- Small-bowel resection
- Surgery for bowel obstruction
- Surgical drainage of abdominal abscess
- Surgical lysis of adhesions
Gallbladder and appendix
- Gallbladder removal
Hernia repair
- Laparoscopic groin-hernia repair
- Robotic hernia repair
Skin and soft tissue
- Incision and drainage of an abscess
- Lipoma removal
- Removal of a soft-tissue mass
Abdominal surgery
- Spleen removal
Abdominal wall
- Abdominal Muscle Separation Repair
Access and nutrition
- Jejunostomy feeding-tube placement
Anorectal
- Anal fistula surgery
- Drainage of anal abscess
- Hemorrhoid removal
- Rubber-band ligation of hemorrhoids
- Surgery for chronic anal fissure
Biopsy
- Lymph Node Biopsy
Breast surgery
- Axillary lymph-node dissection
- Excisional biopsy of a breast mass
- Mastectomy
- Sentinel lymph-node biopsy
Breast Surgery
- Male Breast Reduction
Colorectal
- Pilonidal cyst surgery
- Rectal prolapse repair
Colorectal surgery
- Colostomy Surgery
- Ileostomy Surgery
- Ostomy reversal
Digestive procedures
- Achalasia Surgery
- Acid reflux surgery
Endocrine surgery
- Partial Thyroid Removal
Gastrointestinal
- Feeding tube placement
Hernia surgery
- Sports hernia surgery
Skin & Soft Tissue
- Cyst Removal
Surgical Oncology
- Complex skin lesion excision
Surgical procedures
- Chemo port removal
Vascular Access
- Central line placement
- Chemo port placement
Wound care
- Wound cleaning and debridement
Procedures Most Often Billed to Medicare
2,142 services · 733 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Chemical destruction of first incompetent vein of arm or leg using imaging guidance | Procedure | 36482 |
469 | More than most peers in General Surgery |
| Injection of chemical agent into single incompetent vein of leg using ultrasound guidance | Procedure | 36465 |
182 | More often than most peers in General Surgery |
| Injection of chemical agent into multiple incompetent veins of leg | Procedure | 36471 |
109 | More often than most peers in General Surgery |
| Ultrasonic guidance for needle placement | Imaging | 76942 |
109 | More often than most peers in General Surgery |
| Ultrasound study of one arm or leg veins with compression and maneuvers | Treatment | 93971 |
420 | More than most peers in General Surgery |
| Ultrasound study of arm or leg veins with compression and maneuvers | Treatment | 93970 |
204 | More often than most peers in General Surgery |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
545 | More than most peers in General Surgery |
| 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 | More often than most peers in General Surgery |
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.
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.
Common questions
What is Rex C. Manayan's specialty?
Rex C. Manayan is a general surgeon in Ontario, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “General Surgery”.
NPI registry
Where can I find Rex C. Manayan?
Rex C. 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 Rex C. Manayan?
The number on file is (909) 481-3242. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Rex C. Manayan?
Rex C. 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 Rex C. Manayan's education?
Rex C. 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 Rex C. Manayan have?
Rex C. Manayan has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What is Rex C. Manayan known for?
According to Medicare billing data, Rex C. 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 Rex C. Manayan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Rex C. Manayan. If this is you, claiming it is free.
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