DR. ROBERT D HESSELGESSER MD
NPI 1710979687
Radiology - Radiation Oncology in Orange, CA

Q: What is Robert Hesselgesser's NPI number?

The NPI number for Robert Hesselgesser is 1710979687. It was assigned to this individual provider in the NPPES registry on August 17, 2005.

Q: What is Robert Hesselgesser's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Active since August 17, 2005PECOS EnrolledAccepts Medicare Assignment

101 THE CITY DR S, ORANGE, CA 92868(714) 880-7812 Get Directions Write a Review

NPPES record last updated: January 17, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 17, 2023, Jan 9, 2023, Aug 14, 2019 and 3 more (6 updates tracked since 2018).

On this page

About Dr. Robert D Hesselgesser Md NPPES

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

DR. ROBERT D HESSELGESSER MD (NPI 1710979687) is an individual radiation oncology provider in Orange, California, licensed in California (G22896) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and maintains a secondary practice location in Woodland Hills.

NPPES Registry Identity

NPI1710979687

Entity TypeIndividualMale

Primary Taxonomy2085R0001X

Provider Legal NameDR. ROBERT D HESSELGESSERCredential: MD

Location Address101 THE CITY DR SOrange, CA 92868-3201

Mailing Address200 S Manchester Ave Ste 300Orange, CA 92868-3219 · (714) 456-2986

Phone(714) 880-7812

Sole ProprietorNo

Medical School CMSNew York Medical CollegeGraduated 1971

Enumeration DateAugust 17, 2005

Last NPPES UpdateJanuary 17, 20236 updates tracked since enumeration

NPPES CertifiedJanuary 17, 2023

✔ NPI 1710979687 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0001X

Licenses✔ Licensed in CA · G22896✔ Licensed in MI · 4301115702✔ Licensed in IN · 01081578A

Definition

A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.

Also ListedRadiology · Therapeutic RadiologyTaxonomy 2085R0203X · License 4301115702 (MI)

101 THE CITY DR S, Orange, CA 92868

Open in Google Maps ↗

Secondary Practice Location 1

Location 121300 Erwin StWoodland Hills, CA 91367-3717 · Phone (818) 449-2700 · Fax (818) 610-7461

Other Identifiers 1

Medicaid00G228960CA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Robert D Hesselgesser 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 ID5193734184

PECOS Enrollment IDI20060502000857, I20190124003279

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.

Medicare Billing Reassignments

Medicare enrollment records show Robert Hesselgesser reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Uc Regents Department Of Radiation Oncology

Same address

Radiation Oncology

101 THE CITY DR S
Orange, CA 92868

Reassigned Medicare billing, California enrollment
26 clinicians in this Medicare group

NPI 1386692473 (714) 456-8068

Golden State Radiation Oncology, Inc

49 mi

Radiation Oncology

21300 ERWIN ST
Woodland Hills, CA 90211

Reassigned Medicare billing, California enrollment
3 clinicians in this Medicare group

NPI 1184924193 (424) 249-7500

Parkview Logansport Hospital, Inc.

1,782 mi

Clinic/Center

132 W MAIN ST
Camden, IN 46917

Reassigned Medicare billing, Indiana enrollment
63 clinicians in this Medicare group

NPI 1821671272 (574) 686-2022

Parkview Health System,inc

1,839 mi

Family Medicine

2003 STULTS RD STE 100
Huntington, IN 46750

Reassigned Medicare billing, Indiana enrollment
1,752 clinicians in this Medicare group

NPI 1467779124 (260) 356-5424

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 18

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.

Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mev G6012

Radiation therapy involves directing high-energy particles to destroy cancer cells. The technique targets 3 or more areas, using custom blocks for precise focus. Tangential ports, wedges, and rotational beams adjust the radiation's path, while compensators balance radiation dose. Electron beam therapy with 6-10 mev energy is used for deep-seated tumors.

657 services51 patients

Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy G6002

Stereoscopic x-ray guidance is a technique used in radiation therapy. It involves taking multiple X-ray images from different angles to create a 3D picture of the area to be treated. This helps accurately pinpoint the exact location for radiation delivery, ensuring the therapy is as effective as possible.

474 services44 patients

Design and construction of complex radiation treatment device 77334

The design and construction of a complex radiation treatment device is a process where a specialized instrument is created. This device targets harmful cells with high-energy rays to destroy or damage them, while minimizing impact on healthy cells. This aids in treating conditions like cancer.

175 services48 patients

Radiation treatment management, 5 treatment sessions 77427

Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.

152 services57 patients

Ct guidance for insertion of radiation therapy fields 77014

CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.

139 services13 patients

Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session G6015

Intensity-modulated radiation therapy (IMRT) is a type of cancer treatment. It uses advanced technology to manipulate photon beams of radiation to conform to the shape of a tumor. IMRT allows for the radiation dose to conform more precisely to the three-dimensional shape of the tumor by modulatingâ€”or controllingâ€”the intensity of the radiation beam. This can result in better tumor control and less harm to healthy tissue.

129 services13 patients

Continuing radiation therapy consultation per week 77336

Continuing radiation therapy consultation per week involves regular meetings with your healthcare team. These sessions help monitor your progress, manage side effects, and adjust your treatment plan if necessary. It's a key part of ensuring the effectiveness of your radiation therapy.

119 services46 patients

Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved 77290

This procedure involves collecting necessary data to plan the best radiation treatment. It may cover 3 or more areas or any area requiring special attention. Data collection includes imaging scans and tests to understand the disease's extent and to tailor a precise, effective treatment plan.

90 services51 patients

Calculation of radiation therapy dose 77300

Radiation therapy dose calculation is a process to determine the exact amount of radiation needed to treat a specific area in the body. This calculation helps ensure the treatment is effective while minimizing harm to healthy tissues. It's a key part of planning your radiation therapy.

89 services34 patients

X-ray during radiation therapy 77417

An X-ray during radiation therapy is a medical process that helps in tracking the progress of your treatment. It uses small amounts of radiation to create images of your body's internal structure. This aids in ensuring the therapy is accurately targeting the problem area and not harming healthy tissues.

67 services20 patients

Complex radiation therapy planning 77263

Complex radiation therapy planning is a process to determine the most effective way to deliver radiation to a specific area in your body. It involves detailed imaging to map your body's structure, allowing for precise targeting of cancer cells while sparing healthy tissue.

60 services47 patients

Complex radiation therapy planning for delivery of external radiation 77307

Complex radiation therapy planning involves creating a detailed plan to deliver targeted radiation doses. The process includes imaging scans to identify the area needing treatment, and designing a specific radiation plan to protect healthy tissue while effectively treating the disease.

38 services28 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.

32 services32 patients

Design and construction of complex radiation treatment device 77334

30 services28 patients

Ct guidance for insertion of radiation therapy fields 77014

27 services25 patients

3d radiation therapy planning 77295

3D radiation therapy planning is a procedure that uses computer imaging to map out the area needing treatment. This ensures the radiation targets the disease precisely, while minimizing exposure to surrounding healthy tissues. It's a key step in preparing for effective radiation therapy.

21 services17 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

19 services18 patients

Obtaining data needed to develop the optimal radiation treatment, 1 treatment area 77280

This procedure involves gathering essential information to create the best radiation treatment plan for a specific area. It includes scanning the treatment area and using this data to calculate the precise dose of radiation needed to target the disease effectively, while sparing healthy tissue.

13 services13 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Memorial Hospital

Acute Care Hospitals · Logansport, IN

4/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number150072

Location1101 Michigan AveLogansport, IN 46947 · Cass County

Emergency services Birthing friendly

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. ANKIT BHUPENDRA PATEL D.O.

Radiology (Diagnostic Radiology)

101 THE CITY DR S
ORANGE, CA 92868

Orange County (714) 456-5113

DR. LAURA CATHERINE SKOCZYLAS MD

Obstetrics & Gynecology

101 THE CITY DR S, BUILDING 56, DEPARTMENT OF OB/GYN
ORANGE, CA 92868

Orange County (714) 456-8224

MICHAEL CHENG DO

Internal Medicine (Rheumatology)

101 THE CITY DR S
ORANGE, CA 92868

Orange County (714) 456-7110

AESTHETIC AND PLASTIC SURGERY INSTITUTE

Plastic Surgery

101 THE CITY DR S
ORANGE, CA 92868

Orange County (714) 456-2986

JOSEPH VILLARREAL M.D.

Emergency Medicine

101 THE CITY DR S, BUILDING 1A, ROOM 1009
ORANGE, CA 92868

Orange County (714) 456-5239

DEMI TRAN

Psychiatry & Neurology (Neurology)

101 THE CITY DR S, CITY TOWER, SUITE 400
ORANGE, CA 92868

Orange County (171) 456-6693

DR. ISABEL CARLTON CLARK M.D.

Surgery (Trauma Surgery)

101 THE CITY DR S
ORANGE, CA 92868

Orange County (714) 456-7890

DYLAN LUKATO

Emergency Medicine

101 THE CITY DR S
ORANGE, CA 92868

Orange County (415) 218-8041

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 Robert Hesselgesser's NPI number?

The NPI number for Robert Hesselgesser is 1710979687. It was assigned to this individual provider in the NPPES registry on August 17, 2005.

Where is Robert Hesselgesser located?

Robert Hesselgesser practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 880-7812.

What is Robert Hesselgesser's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Is Robert Hesselgesser enrolled in Medicare?

Yes. Robert Hesselgesser 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.

Which organizations bill Medicare for Robert Hesselgesser's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Hesselgesser reassigns Medicare benefits to 4 organizations: Uc Regents Department Of Radiation Oncology (Orange, CA), Golden State Radiation Oncology, Inc (Woodland Hills, CA), Parkview Logansport Hospital, Inc. (Camden, IN) and Parkview Health System,inc (Huntington, IN). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Robert Hesselgesser's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Robert Hesselgesser accept?

Health plans from CareSource list Robert Hesselgesser as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Robert Hesselgesser affiliated with any hospitals?

According to CMS data, Robert Hesselgesser is affiliated with Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Robert Hesselgesser was last updated on January 17, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.