Sonja Franziska Knittel-Hliddal, MD
Critical Care Medicine (Internal Medicine) Physician · Riverside, CA
Sonja Franziska Knittel-Hliddal, MD is a critical care medicine (internal medicine) physician with a practice address in Riverside, California, and NPI 1356846109, issued on Mar 26, 2018. Check the license (California A184723, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sonja Franziska Knittel-Hliddal
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- A184723 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4234 Riverwalk Pkwy Ste 230, Riverside, CA 92505
- Phone
- (856) 641-8000
- Enumerated
- Mar 26, 2018
- Record last updated
- Sep 26, 2023
- Medicare enrollment
- Enrolled (PECOS I20230921002959); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 723 in California → Look up another NPI →
Also registered at 4234 Riverwalk Pkwy Ste 230
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Abreu, MDHospitalist Physician1942837323
- Faraz Afridi, MDPulmonary Disease Physician1871905257
- Masood Ahmad, M.D.Critical Care Medicine (Internal Medicine) Physician1073069332
- Mohamad Al Sayed, MDEndocrinology, Diabetes & Metabolism Physician1568428134
- Ahmad Alazzeh, MDPulmonary Disease Physician1194037945
- Judy Alfonso, PA-CPhysician Assistant1154471514
Verify Sonja Franziska Knittel-Hliddal in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A184723Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $22.02
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. The 2,708 providers of this specialty with any payment received $2,958.68 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- EL-Bershawi Medical CorpRiverside, CA
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sonja Franziska Knittel-Hliddal among 723 critical care medicine (internal medicine) physician records in California
Sonja Franziska Knittel-Hliddal, MD is one of 723 critical care medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 91% of them.
- NPI issued2018 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2014 · median 2005 among the 559 with a school on file
- Record last updated2023 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
All 723 in California → Every provider in Riverside → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Masood Ahmad, M.D.Riverside, CA 925051073069332
- Mona Alipour, M.DRiverside, CA 925051053709071
- Edgar Ardila, MDRiverside, CA 925051295729648
- Richard Bradburne, MDRiverside, CA 925051003983925
- Mindy Bui, DORiverside, CA 925051407273600
- Cedric Franklin Rutland, M.D.Riverside, CA 925051811122799
- Rohit Godbole, M.D.Riverside, CA 925051861758823
- Muhammad Iqbal, M.D.Riverside, CA 925051225287881
Common questions
What is Sonja Franziska Knittel-Hliddal, MD's NPI number?
Sonja Franziska Knittel-Hliddal, MD's National Provider Identifier (NPI) is 1356846109, issued on Mar 26, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Sonja Franziska Knittel-Hliddal, MD located?
The NPPES record lists a practice address at 4234 Riverwalk Pkwy Ste 230, Riverside, CA, 92505. Phone: (856) 641-8000. Providers update this record themselves, so call before visiting.
How can I verify Sonja Franziska Knittel-Hliddal, MD's license?
NPPES lists California license number A184723, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.