DR. EDWARD DIAO MD
NPI 1427009794
Orthopaedic Surgery in San Francisco, CA
NPI Status: Active since May 12, 2006
Contact Information
450 SUTTER ST RM 910
SAN FRANCISCO, CA
ZIP 94108
Phone: (415) 362-8880
Fax: (415) 362-8045
- Individual
- Male
- Orthopaedic Surgery
- PECOS Enrolled
- CLIA Number: 05D2037615
- CLIA Cert. Type: Physician Office
- CLIA Exp. Date: 03-01-2026
About EDWARD DIAO
This page provides the complete NPI Profile along with additional information for Edward Diao, a provider established in San Francisco, California with a medical specialization in Orthopaedic Surgery. The healthcare provider is registered in the NPI registry with number 1427009794 assigned on May 2006. The practitioner's primary taxonomy code is 207X00000X with license number G77448 (CA). The provider is registered as an individual and his NPI record was last updated January 2026.
- NPI
- 1427009794
- Provider Name
- DR. EDWARD DIAO MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 450 SUTTER ST RM 910 SAN FRANCISCO, CA 94108
- Location Phone
- (415) 362-8880
- Location Fax
- (415) 362-8045
- Mailing Address
- 450 SUTTER ST SUITE 500 SAN FRANCISCO, CA 94108
- Mailing Phone
- (415) 362-8880
- Mailing Fax
- (415) 362-8045
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 05-12-2006
- Last Update Date
- 01-22-2026
- Code Navigator
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Orthopaedic Surgery
- Taxonomy Code
- 207X00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G77448
- License State
- CA
- Taxonomy Description
- An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207XS0106X | Allopathic & Osteopathic Physicians | Orthopaedic Surgery | G77448 (CA) |
Insurance Plans Accepted
According to publicly available information the provider might be accepting the following health plans from these health insurance companies:
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
*Please verify directly with this provider to make sure your insurance plan is currently accepted.
Additional Identifiers
The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.
| Identifier | Type / Code | Identifier State | Identifier Issuer |
|---|---|---|---|
| 00G774480 | MEDICAID (05) | CA |
Medicare Participation & PECOS Enrollment Status
Edward Diao is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Provider Referred Orders for Durable Medical Equipment, Devices & Supplies
The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.
Orthotic Devices
DME-Orthotic Devices (DF000N)
Dynamic adjustable finger extension/flexion device, includes soft interface material (HCPCS:E1825)
1 DME suppliers used 12 Medicare Claims 12 Services Paid
DME-Orthotic Devices (DF000N)
Wrist hand finger orthosis, without joint(s), prefabricated, off-the-shelf, any type (HCPCS:L3809)
2 DME suppliers used 11 Medicare Claims 11 Services Paid
DME-Orthotic Devices (DF000N)
Wrist hand orthosis, wrist extension control cock-up, non molded, prefabricated, off-the-shelf (HCPCS:L3908)
1 DME suppliers used 12 Medicare Claims 13 Services Paid
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Aspiration and/or injection of fluid from medium joint
Complete ultrasound scan of joint
Established patient office or other outpatient visit, 20-29 minutes
Imaging guidance for procedure, 60 minutes or less
Injection into tendon or ligament
Injection of anesthetic agent and/or steroid into other nerve or branch
Melanoma (skin cancer) excision
New patient office or other outpatient visit, 30-44 minutes
Upper limb (arm) arthroscopy (minimally invasive joint repair)
This procedure involves a needle being inserted into a medium-sized joint, such as a knee or shoulder, to remove (aspirate) excess fluid. Sometimes, medication may also be injected into the joint to reduce inflammation and pain.
This service was performed 24 times for 15 patientsA complete ultrasound scan of a joint is a non-invasive procedure using sound waves to create images of your joint. It helps identify problems like inflammation, injury, or disease. It's painless, safe, and doesn't involve radiation.
This service was performed 37 times for 27 patientsThis is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
This service was performed 114 times for 64 patientsImaging guidance is a procedure where real-time images are used to direct medical tools during a treatment. This technique helps to improve accuracy and safety. The procedure typically lasts 60 minutes or less.
This service was performed 174 times for 84 patientsAn injection into a tendon or ligament involves placing medication directly into these areas to help reduce inflammation and pain. It's often used for conditions like arthritis or tendonitis. The procedure is quick and usually involves a local anesthetic.
This service was performed 15 times for 13 patientsThis procedure involves injecting an anesthetic agent or steroid into a specific nerve or its branch. The goal is to relieve pain by reducing inflammation and numbing the area. It is commonly used for chronic pain management. The process is safe and usually quick.
This service was performed 17 times for 15 patientsMelanoma excision is a procedure where a surgeon removes melanoma, a type of skin cancer, and some surrounding healthy tissue. Local anesthesia is applied to numb the area. The goal is to completely remove the cancer and prevent its spread. Healing time varies.
This service was performed for 1-10 patientsThis service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
This service was performed 64 times for 64 patientsUpper limb arthroscopy is a minimally invasive procedure used to examine and treat issues within your arm's joints. A small camera, called an arthroscope, is inserted through a tiny incision, providing a clear view of the joint. This method often results in less pain and faster recovery compared to open surgery.
This service was performed for 1-10 patientsPhysician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 94108 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99203
- Average New Patient Price $104.51
- Minimum New Patient Price $69
- Maximum New Patient Price $202.35
- Average New Patient Copayment $26.12
- Minimum New Patient Copayment $17.25
- Maximum New Patient Copayment $50.58
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99213
- Average Established Patient Price $84.91
- Minimum Established Patient Price $23.44
- Maximum Established Patient Price $166.46
- Average Established Patient Copayment $21.22
- Minimum Established Patient Copayment $5.86
- Maximum Established Patient Copayment $41.61
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
CLIA Information
The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:
- CLIA Number
- 05D2037615
- Facility Type
- Physician Office
- Certificate Effective Date
- March 02, 2024
- Certificate Expiration Date
- March 01, 2026
- Laboratory Director
- EDWARD DIAO
- Certificate Type
- Certificate of Waiver
- Certificate Type Description
- This CLIA certificate is issued to Edward Diao to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria.
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1427009794, we treat the final digit (4) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 66 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1427009794, enumerated as an "individual" on May 12, 2006.
The provider is located at 450 SUTTER ST RM 910 SAN FRANCISCO, CA 94108 and the phone number is (415) 362-8880.
Orthopaedic Surgery with taxonomy code 207X00000X.
The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.