DR. SONJA FRANZISKA KNITTEL-HLIDDAL MD
NPI 1356846109
Internal Medicine - Critical Care Medicine in Riverside, CA

Q: What is Sonja Knittel-hliddal's NPI number?

The NPI number for Sonja Knittel-hliddal is 1356846109. It was assigned to this individual provider in the NPPES registry on March 26, 2018.

Q: What is Sonja Knittel-hliddal's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Active since March 26, 2018PECOS EnrolledAccepts Medicare Assignment

4234 RIVERWALK PKWY STE 230, RIVERSIDE, CA 92505(856) 641-8000 Get Directions Write a Review

NPPES record last updated: September 26, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Aug 17, 2023, Jul 10, 2023, Mar 26, 2018 (3 updates tracked since 2018).

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About Dr. Sonja Franziska Knittel-hliddal Md NPPES

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

DR. SONJA FRANZISKA KNITTEL-HLIDDAL MD (NPI 1356846109) is an individual critical care medicine provider in Riverside, California, licensed in California (A184723) and active in the NPI registry since March 2018. She is enrolled in Medicare PECOS and is a graduate of Other (2014).

NPPES Registry Identity

NPI1356846109

Entity TypeIndividualFemale

Primary Taxonomy207RC0200X

Provider Legal NameDR. SONJA FRANZISKA KNITTEL-HLIDDALCredential: MD

Location Address4234 RIVERWALK PKWY STE 230Riverside, CA 92505-3312

Mailing AddressP O Box 743892 Sute 230Los Angeles, CA 90074-3312 · (951) 781-3672

Phone(856) 641-8000

Sole ProprietorYes

Medical School CMSOtherGraduated 2014

Enumeration DateMarch 26, 2018

Last NPPES UpdateSeptember 26, 20233 updates tracked since enumeration

NPPES CertifiedSeptember 26, 2023

✔ NPI 1356846109 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RC0200X

License✔ Licensed in CA · A184723

Definition

An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.

Also ListedInternal MedicineTaxonomy 207R00000X · License A184723 (CA)

4234 RIVERWALK PKWY STE 230, Riverside, CA 92505

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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

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. Sonja Franziska Knittel-hliddal 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 ID6608220827

PECOS Enrollment IDI20230921002959

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 Sonja Knittel-hliddal reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

El-Bershawi Medical Corp

Same address

Critical Care Medicine

4234 RIVERWALK PKWY, SUITE 230
Riverside, CA 92505

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

NPI 1386813103 (951) 781-3672

Faculty Physicians And Surgeons Of Llusm

Same address

Ophthalmology

4244 RIVERWALK PKWY, STE 100
Riverside, CA 92505

Reassigned Medicare billing, California enrollment
2,584 clinicians in this Medicare group

NPI 1033361886 (909) 558-2154

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 7

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.

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

556 services195 patients

Critical care, each additional 30 minutes 99292

Critical care refers to special attention given to patients facing life-threatening conditions. Each additional 30 minutes indicates the extension of this specialized care. This might include close monitoring, medication adjustments, and immediate interventions as needed.

310 services93 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

29 services28 patients

Insertion of non-tunneled central venous tube for infusion (5 years or older) 36556

This procedure involves placing a thin tube into a large vein, usually in the neck or chest, to administer medication or fluids. It's done under local anesthesia to minimize discomfort. It's a standard, safe procedure for individuals aged 5 and above.

19 services18 patients

Manual attempt to restore blood circulation and breathing 92950

This procedure, known as cardiopulmonary resuscitation (CPR), involves chest compressions and rescue breaths to help maintain blood flow and oxygen supply when your heart and breathing have stopped. It's a vital emergency response to save lives.

19 services15 patients

Emergent insertion of breathing tube into windpipe using an endoscope 31500

This is a procedure where a thin tube is inserted into your windpipe to aid in breathing. It's done in emergency situations, using an endoscope, a tool with a light and camera, to ensure correct placement.

15 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92505 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

$136.04 typical visit price

range $59.60 – $179.42

Typical copayment $34.01 (range $14.90 – $44.85)

Most-billed visit code 99204

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

Most-billed visit code 99214

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. SAHAR HAMIDY OSMAN M.D.

Psychiatry & Neurology (Neurocritical Care)