Doctor profile · Federal record
Dr. Melissa Mao, MD
Surgical Oncology Physician (CMS: Surgical Oncology) · Surgery Physician · Surgery Physician · Orange, CA
- NPI 1245594498
- Accepts Medicare
- 14 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
101 the City Dr S Bldg 23
Orange, CA 928683201
(714) 456-8000 - Additional location
-
8815 Germantown Ave Ste 22
Philadelphia, PA 191182722
(215) 248-8887
fax (215) 836-5372 - Mailing address
-
200 S Manchester Ave Ste 300
Orange, CA 928683219
Credentials & registration
- NPI registered
- July 2012 — 14 yrs on file
- Profile last updated
- June 2, 2025
- Year of graduation
- 2012 — 14 yrs since
- Specialty taxonomy
- 2086X0206X — NUCC code
- State licenses (2)
- California #A167735 · Pennsylvania #MD465525
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1245594498. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
56
Distinct HCPCS
3
Medicare allowed
$3,604
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99441 |
Telephone medical discussion with physician, 5-10 minutes | 24 | 20 | $38 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 17 | 15 | $71 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 15 | 14 | $100 |
In context: peer comparison
Among 4 peers in this city , average services per provider: 77. This provider delivers 0.7× the peer median.Open Payments
Industry payments received
All-time total
$262
Transactions
3
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Corcept Therapeutics | 3 | $261.79 |
By nature of payment
Frequently asked questions
What is Dr. Melissa Mao's medical specialty?
Dr. Melissa Mao practices Surgical Oncology Physician in Orange, CA.
Where does Dr. Melissa Mao practice?
Dr. Melissa Mao practices at 101 the City Dr S Bldg 23, Orange, CA 928683201. Office phone: 7144568000.
What is Dr. Melissa Mao's NPI?
Dr. Melissa Mao's National Provider Identifier (NPI) is 1245594498, issued by NPPES.
Does Dr. Melissa Mao accept Medicare assignment?
Yes. Dr. Melissa Mao accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Melissa Mao commonly perform?
Top Medicare-reported procedures in 2023: Telephone medical discussion with physician (HCPCS 99441); Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.