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MELISSA MARIE CALLIHAM P.A-C
NPI 1790725687
Physician Assistant in Foothill Ranch, CA

Active since June 08, 2006PECOS Enrolled
26672 PORTOLA PKWY STE 100, FOOTHILL RANCH, CA 92610(949) 557-0710 Get Directions Write a Review

NPPES record last updated: May 29, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: May 29, 2026, Jun 14, 2024 (2 updates tracked since 2024).

About Melissa Marie Calliham P.a-c NPPES

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

MELISSA MARIE CALLIHAM P.A-C (NPI 1790725687) is an individual physician assistant in Foothill Ranch, California, licensed in California (PA18137) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1790725687
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMELISSA MARIE CALLIHAMCredential: P.A-C
Location Address26672 PORTOLA PKWY STE 100Foothill Ranch, CA 92610-1773
Mailing Address2100 Powell Street, Ste 920Emeryville, CA 94608-1803 · (510) 350-2600 · Fax (510) 879-9100
Phone(949) 557-0710
Sole ProprietorNo
Enumeration DateJune 8, 2006
Last NPPES UpdateMay 29, 20262 updates tracked since enumeration
NPPES CertifiedMay 29, 2026
✔ NPI 1790725687 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in CA · PA18137
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
26672 PORTOLA PKWY STE 100, Foothill Ranch, CA 92610
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Melissa Marie Calliham P.a-c is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 2

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.

Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
51 services47 patients
Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
25 services25 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92610 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
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

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

NANCY DINH PA
Physician Assistant (Medical)
26672 PORTOLA PKWY STE 100
FOOTHILL RANCH, CA 92610
Orange County (949) 764-6738

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 Calliham's NPI number?

The NPI number for Melissa Calliham is 1790725687. It was assigned to this individual provider in the NPPES registry on June 8, 2006.

Where is Melissa Calliham located?

Melissa Calliham practices at 26672 Portola Pkwy Ste 100, Foothill Ranch, CA 92610. The listed phone number is (949) 557-0710.

What is Melissa Calliham's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Melissa Calliham enrolled in Medicare?

Yes. Melissa Calliham is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Melissa Calliham was last updated on May 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.