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Edit this profileAt a glance
- 80 Grand Ave, Suite 600, Oakland, CA 94612
About Dr. Masem
Based in Oakland, CA, Mathias A. Masem, M.D. is listed in the NPI registry under orthopaedic hand surgery. Mathias graduated from University of Minnesota Medical School in 1975. Mathias is also listed as specializing in orthopaedic surgery. According to Medicare claims data, Mathias cared for 529 Medicare patients across 1,048 services. The services billed most often include injection, triamcinolone acetonide, not otherwise specified, 10 mg, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg. NPI 1508810938 identifies this record in the national registry.
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
- (510) 763-0884
- Email not available
Practice Locations
80 GRAND AVE SUITE 600
Oakland, CA 94612
Conditions Commonly Evaluated or Treated
Within Hand 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
Arthritis & Joints
- Bone Spur on Finger
- Hand Arthritis
- Kienbock's Disease
- Stiff Fingers
- Hand and Wrist Arthritis
- Wrist sprain
Congenital
Fractures & Injuries
- Boxer's Fracture
- Broken Scaphoid Bone
- Dislocated Finger
- Black Toenail
- Hand and finger fractures
- Jammed Finger
- Severed Finger
- Torn Thumb Ligament
- Wrist Cartilage Tear
- Wrist fracture
Injuries
- Boxer's Knuckle
- Crushed Hand Injury
- Foreign Object in Hand
- Hand Compartment Syndrome
- Jersey Finger
- Sprained Finger
Lumps & Bumps
Lumps & Masses
Nails
Nerves
- Cut Nerve in Hand
- Hand Neuroma
- Hand Numbness and Tingling
- Hand Weakness
- Pinched Nerve in Wrist
- Wrist Drop
- Carpal tunnel
- Cubital tunnel syndrome
Tendons
- Intersection Syndrome
- Swan Neck Deformity
- De Quervain tenosynovitis
- Dupuytren's contracture
- Golfer's elbow
- Mallet Finger
- Tennis elbow
- Torn Hand Tendon
- Trigger finger
Circulation
Infections
Procedures & services
Bone surgery
Cyst & Lump Removal
Fracture Repair
Injections
Injections & Therapy
- Custom Hand Splinting
- Mallet Finger Splinting
- PRP Shot for Wrist or Elbow
- Hand therapy
- Tendon Sheath Injection
Joint surgery
Joint Surgery
- Finger Joint Fusion
- Finger Joint Replacement
- Thumb Arthritis Surgery
- Wrist Arthroscopy
- Wrist Cartilage Repair
- Wrist Fusion
- Thumb Ligament Repair
Minor procedures
Nail procedures
Nerve surgery
Orthopedics
Pain management
Spine & Orthopedics
Tendon surgery
Tendon Surgery
- Tendon Repair Surgery
- Tendon Transfer Surgery
- Thumb Tendon Release
- Dupuytren contracture surgery
- Tennis Elbow Surgery
- Trigger finger release
Trauma & Reconstruction
- Drainage of Finger Infection
- Extra Finger Removal
- Fingertip Reconstruction
- Severed Finger Reattachment
- Webbed Finger Separation
Wound repair
Nerve Surgery
Procedures Most Often Billed to Medicare
1,048 services · 529 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Aspiration and/or injection of fluid from small joint using ultrasound guidance | Procedure | 20604 |
59 | More often than most peers in Orthopaedic Hand Surgery |
| Aspiration and/or injection of fluid from medium joint using ultrasound guidance | Procedure | 20606 |
20 | Less often than most peers in Orthopaedic Hand Surgery |
| Release of wrist ligament using an endoscope | Procedure | 29848 |
16 | Less often than most peers in Orthopaedic Hand Surgery |
| Aspiration and/or injection of fluid from medium joint | Procedure | 20605 |
15 | Less often than most peers in Orthopaedic Hand Surgery |
| X-ray of hand, minimum of 3 views | Imaging | 73130 |
49 | Less often than most peers in Orthopaedic Hand Surgery |
| X-ray of wrist, minimum of 3 views | Imaging | 73110 |
48 | Less often than most peers in Orthopaedic Hand Surgery |
| X-ray of finger, minimum of 2 views | Imaging | 73140 |
17 | Less often than most peers in Orthopaedic Hand Surgery |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Drug given | J3301 |
296 | As often as other peers in Orthopaedic Hand Surgery |
| Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg | Drug given | J0702 |
109 | Less often than most peers in Orthopaedic Hand Surgery |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
251 | More often than most peers in Orthopaedic Hand 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.
Other orthopaedic hand surgeons in Oakland 7
Same specialty, same city.
Trained at University of Minnesota Medical School 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1975 at University of Minnesota Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid from small joint using ultrasound guidance 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Mathias A. Masem specialize in?
Mathias A. Masem is an orthopaedic hand surgeon in Oakland, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Orthopaedic Hand Surgery”.
NPI registry
Where is Mathias A. Masem located?
Mathias A. Masem is listed at 80 Grand Ave Suite 600, Oakland, CA 94612. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Mathias A. Masem's phone number?
The number on file is (510) 763-0884. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Mathias A. Masem's NPI number?
Mathias A. Masem's National Provider Identifier is 1508810938. 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
Where did Mathias A. Masem train?
Mathias A. Masem attended University of Minnesota Medical School, graduating in 1975. This comes from the CMS National Downloadable File.
CMS public data
How long has Mathias A. Masem been practicing?
Mathias A. Masem has 51 years experience. Calculated from a graduation year of 1975, reported in the CMS National Downloadable File.
CMS public data
What does Mathias A. Masem do most often?
According to Medicare billing data, Mathias A. Masem performs procedures including aspiration and/or injection of fluid from small joint using ultrasound guidance, aspiration and/or injection of fluid from medium joint using ultrasound guidance and release of wrist ligament using an endoscope; reads or performs imaging such as x-ray of hand, minimum of 3 views and x-ray of wrist, minimum of 3 views, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Mathias A. Masem confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Mathias A. Masem. If this is you, claiming it is free.
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