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DR. MELISSA LING MAO MD
NPI 1245594498
Surgery - Surgical Oncology in Orange, CA

Active since July 02, 2012PECOS EnrolledAccepts Medicare Assignment
101 THE CITY DR S BLDG 23, ORANGE, CA 92868(714) 456-8000 Get Directions Write a Review

NPPES record last updated: June 2, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jun 2, 2025, Mar 14, 2023, Mar 3, 2020 and 1 more (4 updates tracked since 2019).

About Dr. Melissa Ling Mao Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MELISSA LING MAO MD (NPI 1245594498) is an individual surgical oncology provider in Orange, California, licensed in California (A167735) and active in the NPI registry since July 2012. She is enrolled in Medicare PECOS, maintains a secondary practice location in Philadelphia, and is a graduate of Temple University School Of Medicine (2012).

NPPES Registry Identity

NPI1245594498
Entity TypeIndividualFemale
Primary Taxonomy2086X0206X
Provider Legal NameDR. MELISSA LING MAOCredential: MD
Location Address101 THE CITY DR S BLDG 23Orange, CA 92868-3201
Mailing Address200 S Manchester Ave Ste 300Orange, CA 92868-3219 · (714) 456-2986
Phone(714) 456-8000
Sole ProprietorNo
Medical School CMSTemple University School Of MedicineGraduated 2012
Enumeration DateJuly 2, 2012
Last NPPES UpdateJune 2, 20254 updates tracked since enumeration
NPPES CertifiedJune 2, 2025
✔ NPI 1245594498 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgery · Surgical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2086X0206X
License✔ Licensed in CA · A167735
Definition
A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research.
Also ListedSurgeryTaxonomy 208600000X · License MD465525 (PA), A167735 (CA)
101 THE CITY DR S BLDG 23, Orange, CA 92868
Open in Google Maps ↗

Secondary Practice Location 1

Location 18815 Germantown Ave Ste 22Philadelphia, PA 19118-2722 · Phone (215) 248-8887 · Fax (215) 836-5372

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Melissa Ling Mao Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5294088563
PECOS Enrollment IDI20200421001796
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Telephone medical discussion with physician, 5-10 minutes 99441
A telephone medical discussion with a physician is a brief, 5-10 minute call where you can discuss your health concerns. It's a convenient way to receive medical advice without needing to visit a clinic. It's important to prepare questions in advance to make the most of this time.
29 services25 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This 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.
25 services19 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This 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.
23 services19 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This 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.
15 services15 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This 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.
15 services15 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$187.60 typical visit price
range $62.96 – $187.60
Typical copayment $46.90 (range $15.74 – $46.90)
Most-billed visit code 99205
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ARASH MAHAJERIN M.D.
Pediatrics (Pediatric Hematology-Oncology)
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-8000
DR. ZAHRA SADAT HAMEDI MD
Internal Medicine (Hematology & Oncology)
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-7890
JULIE SMITH NP
Internal Medicine (Hematology & Oncology)
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-8000
HEEKYUNG KIM
Student in an Organized Health Care Education/Training Program
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (949) 819-5969
JINO PARK MD
Radiology (Radiation Oncology)
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-5651
REGENTS OF THE UNIVERSITY OF CALIFORNIA
Clinical Medical Laboratory
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-5889
DR. ARASH REZAZADEH KALEBASTY M.D.
Internal Medicine (Hematology & Oncology)
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-8000
DR. MARK E LINSKEY MD
Neurological Surgery
101 THE CITY DR S BLDG 23
ORANGE, CA 92868
Orange County (714) 456-8000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Melissa Mao's NPI number?

The NPI number for Melissa Mao is 1245594498. It was assigned to this individual provider in the NPPES registry on July 2, 2012.

Where is Melissa Mao located?

Melissa Mao practices at 101 The City Dr S Bldg 23, Orange, CA 92868. The listed phone number is (714) 456-8000.

What is Melissa Mao's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Surgical Oncology, with taxonomy code 2086X0206X.

Is Melissa Mao enrolled in Medicare?

Yes. Melissa Mao is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Melissa Mao was last updated on June 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.