Dr. Steven W. Rittenberg, MD
- Medicare services, 2023
- 231
- Medicare patients, 2024
- 13
- Part D claims, 2024
- 3,691
- Hospital affiliations
- 1
- Medical groups
- 2
- Practice address
- 2103 E Gonzales Rd, Oxnard, CA 93036
- Practice phone
- Call (805) 650-4700
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Southern California Permanente Medical Group
Oxnard, California
Find Dr. Rittenberg's professional email, personal email and mobile number
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Dr. Steven W. Rittenberg is an adolescent medicine (internal medicine) physician in Oxnard, California
Dr. Rittenberg practices at Southern California Permanente Medical Group in Oxnard, California.
Dr. Rittenberg's NPI, 1851455893, was assigned on December 21, 2006. Dr. Rittenberg holds Washington license MD00033053.
- NPI
- 1851455893NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830115377
- NPI enumeration date
- December 21, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 650-4700
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Steven W. Rittenberg practices at Southern California Permanente Medical Group in Oxnard, California
Dr. Rittenberg's primary practice is Southern California Permanente Medical Group, at 2103 E Gonzales Rd, Oxnard, CA 93036 in Ventura County. The practice phone is (805) 650-4700.
- Southern California Permanente Medical Group2103 E Gonzales Rd, Oxnard, CA 93036 · Ventura CountyPhone(805) 650-4700
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Steven W. Rittenberg is affiliated with 3 sites of care and 2 medical groups
Dr. Rittenberg's primary practice is Southern California Permanente Medical Group in Oxnard, California. Dr. Rittenberg is also affiliated with Kaiser Permanente Woodland Hills Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Rittenberg to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Steven W. Rittenberg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Rittenberg practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Southern California Permanente Medical Group | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Steven W. Rittenberg is one of 37 adolescent medicine (internal medicine) physicians in California
Internal medicine is Dr. Rittenberg's primary specialty in the NPI Registry, under taxonomy code 207RA0000X. The record also lists adolescent medicine. Dr. Rittenberg is licensed in Washington.
Specialties and state licenses
- Adolescent medicine (internal medicine), WashingtonPrimary
Adolescent medicine (internal medicine) physicians near Dr. Rittenberg
Counts of adolescent medicine (internal medicine) physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Steven W. Rittenberg billed Medicare for 231 services in 2023
CMS data shows 231 Medicare services from Dr. Rittenberg across 5 procedure codes in 2023, for 13 Medicare patients. Medicare paid $15,135 for them. Every service was in an office.
Dr. Rittenberg's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 5182023: 17866%
- Other services
- 2022: 2272023: 5377%
- Lab and pathology
- 2022: 502023: 0100%
- Tests and treatments
- 2022: 622023: 0100%
Dr. Rittenberg compared with the California median for adolescent medicine (internal medicine) physicians, 2023
- Dr. Rittenberg
- California median
- Medicare services
- 231vs 231Close to median
- Medicare patients
- 13vs 9486% below
- Part D claims
- 3,092vs 22613.7 times
Medians across 31 adolescent medicine (internal medicine) physicians in California with Dmand AI profiles that report each measure.
Dr. Rittenberg's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Rittenberg and other adolescent medicine (internal medicine) physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Steven W. Rittenberg treated 13 Medicare patients in 2024, average age 66
CMS counts 13 Medicare patients who saw Dr. Rittenberg in 2024. Their average risk score is 1.67, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Rittenberg's median patient age at 62, with 47% women.
Dr. Rittenberg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women47%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Steven W. Rittenberg wrote 3,691 Medicare Part D claims in 2024
In 2024, Dr. Rittenberg wrote 3,691 Medicare Part D claims for 842 patients. 90% of them were for generic drugs. CMS names the drug for 3,092 of them, across 79 drugs with 11 or more claims each, at $71,737 in total drug cost. In 2023, CMS named 3,266 claims across 72 drugs.
Dr. Rittenberg's Part D claims by kind of drug, 2024
- Generic3,314 claims90%
- Brand-name346 claims9%
- Other31 claims1%
Dr. Rittenberg's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Rittenberg's Part D claims, 2024
- Opioids4%139 of 3,691 claims
- Antibiotics4%133 of 3,691 claims
- Antipsychotics, patients 65 and over0%16 of 3,691 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,2662024: 3,0925%
Drugs named by CMS: 79 in 2024, 72 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Steven W. Rittenberg takes part in Medicare
Dr. Rittenberg accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Sources for Dr. Steven W. Rittenberg's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Steven W. Rittenberg
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Steven W. Rittenberg's NPI number?
Dr. Steven W. Rittenberg's NPI number is 1851455893. It was assigned on December 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Steven W. Rittenberg?
Dr. Steven W. Rittenberg is an adolescent medicine (internal medicine) physician in Oxnard, California. The primary specialty in the NPI Registry is Adolescent Medicine (Internal Medicine) Physician (taxonomy code 207RA0000X).
Where does Dr. Steven W. Rittenberg practice?
Dr. Rittenberg practices at 2103 E Gonzales Rd, Oxnard, CA 93036. Dr. Rittenberg's primary practice is Southern California Permanente Medical Group in Oxnard, California. Dmand AI also links Dr. Rittenberg to 1 group practice or clinic and 1 medical group.
What is Dr. Steven W. Rittenberg's office phone number?
The practice phone on file for Dr. Rittenberg is (805) 650-4700.
What is Dr. Steven W. Rittenberg's medical license number?
Dr. Rittenberg holds Washington license MD00033053.
Which hospitals is Dr. Steven W. Rittenberg affiliated with?
Dr. Rittenberg is affiliated with Kaiser Permanente Woodland Hills Medical Center.
What medical group is Dr. Steven W. Rittenberg part of?
Dr. Rittenberg is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Rittenberg to 1 more medical group.
Does Dr. Steven W. Rittenberg accept Medicare?
Yes. CMS data shows Dr. Rittenberg billed Medicare for 231 services in 2023, and Dr. Rittenberg accepts Medicare assignment.
How many Medicare patients does Dr. Steven W. Rittenberg see?
CMS counts 13 Medicare patients who saw Dr. Rittenberg in 2024, with an average age of 66.
What services does Dr. Steven W. Rittenberg bill to Medicare?
In 2023, Dr. Rittenberg's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and office visit, established patient (99215).
What drugs does Dr. Steven W. Rittenberg prescribe most?
In 2024 Medicare Part D data, Dr. Rittenberg's most prescribed drugs by claims were Atorvastatin Calcium, Rosuvastatin Calcium and Lisinopril.
How long has Dr. Steven W. Rittenberg been practicing?
Dr. Rittenberg graduated from medical school in 1993, 33 years ago.
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