1. Home
  2. Directory
  3. California
  4. Santa Monica
  5. Internal Medicine
  6. NPI Profile

SARAH RUTH RETTINGER MD
NPI 1366691842
Internal Medicine - Endocrinology, Diabetes & Metabolism in Santa Monica, CA

Active since September 09, 2008PECOS EnrolledAccepts Medicare Assignment
1831 WILSHIRE BLVD STE A, SANTA MONICA, CA 90403(310) 829-8584(424) 291-4205 Get Directions Write a Review

NPPES record last updated: April 19, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 19, 2021, Aug 21, 2020, Jan 24, 2019 and 2 more (5 updates tracked since 2017).

About Sarah Ruth Rettinger Md NPPES

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

SARAH RUTH RETTINGER MD (NPI 1366691842) is an individual endocrinology, diabetes & metabolism provider in Santa Monica, California, licensed in California (A88064) and active in the NPI registry since September 2008. She is enrolled in Medicare PECOS, maintains a secondary practice location in Santa Monica, and is a graduate of Yale University School Of Medicine (2002).

NPPES Registry Identity

NPI1366691842
Entity TypeIndividualFemale
Primary Taxonomy207RE0101X
Provider Legal NameSARAH RUTH RETTINGERCredential: MD
Location Address1831 WILSHIRE BLVD STE ASanta Monica, CA 90403-5778
Mailing Address725 W La Veta Ave, Suite 220Orange, CA 92868-4403 · (714) 771-5700 · Fax (714) 771-9977
Phone(310) 829-8584
Fax(424) 291-4205
Sole ProprietorYes
Medical School CMSYale University School Of MedicineGraduated 2002
Enumeration DateSeptember 9, 2008
Last NPPES UpdateApril 19, 20215 updates tracked since enumeration
NPPES CertifiedApril 19, 2021
✔ NPI 1366691842 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · A88064
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License A88064 (CA)
1831 WILSHIRE BLVD STE A, Santa Monica, CA 90403
Open in Google Maps ↗

Secondary Practice Location 1

Location 12125 Arizona AveSanta Monica, CA 90404-1337 · Phone (310) 829-8751 · Fax (310) 315-6113

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

Sarah Ruth Rettinger 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 ID5294958625
PECOS Enrollment IDI20140603001206
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 Reassignment

Medicare enrollment records show Sarah Rettinger reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Providence Saint Johns Medical Foundation
0.4 mi
Specialist
2121 SANTA MONICA BLVD
Santa Monica, CA 90404
  • Reassigned Medicare billing, California enrollment
  • 461 clinicians in this Medicare group
NPI 1770093734 (310) 582-7312

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 5

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.

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.
444 services199 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
37 services37 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
27 services22 patients
Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report 95251
This procedure involves placing a small sensor under your skin to continuously monitor your blood sugar levels in tissue fluid. The data is interpreted and a report is generated to help manage your diabetes more effectively.
26 services11 patients
Telephone medical discussion with physician, 21-30 minutes 99443
This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.
17 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90403 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
12 suppliers30 claims58 services$5.69 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
3 suppliers44 claims44 services$194.27 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

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

DR. ROSE HWEI-DA LIN M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
1831 WILSHIRE BLVD STE A
SANTA MONICA, CA 90403
Los Angeles County (310) 829-8584

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 Sarah Rettinger's NPI number?

The NPI number for Sarah Rettinger is 1366691842. It was assigned to this individual provider in the NPPES registry on September 9, 2008.

Where is Sarah Rettinger located?

Sarah Rettinger practices at 1831 Wilshire Blvd Ste A, Santa Monica, CA 90403. The listed phone number is (310) 829-8584.

What is Sarah Rettinger's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Sarah Rettinger enrolled in Medicare?

Yes. Sarah Rettinger 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 organization bills Medicare for Sarah Rettinger's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sarah Rettinger reassigns Medicare benefits to Providence Saint Johns Medical Foundation (Santa Monica, CA). The 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 Sarah Rettinger's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Sarah Rettinger was last updated on April 19, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.