DR. SADHIS RIVAS MD
NPI 1659445427
Internal Medicine - Endocrinology, Diabetes & Metabolism in Brewster, NY

Q: What is Sadhis Rivas's NPI number?

The NPI number for Sadhis Rivas is 1659445427. It was assigned to this individual provider in the NPPES registry on November 20, 2006.

Q: What is Sadhis Rivas's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Sadhis Rivas was last updated on January 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months 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.

Active since November 20, 2006PECOS EnrolledAccepts Medicare Assignment

111 CLOCK TOWER CMNS, BREWSTER, NY 10509(845) 279-5187(855) 703-7570 Get Directions Write a Review

NPPES record last updated: January 28, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 28, 2026, May 17, 2019, Jun 24, 2016 (3 updates tracked since 2016).

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About Dr. Sadhis Rivas Md NPPES

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

DR. SADHIS RIVAS MD (NPI 1659445427) is an individual endocrinology, diabetes & metabolism provider in Brewster, New York, licensed in New York (161375) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS, is affiliated with Putnam Hospital Center, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1659445427

Entity TypeIndividualFemale

Primary Taxonomy207RE0101X

Provider Legal NameDR. SADHIS RIVASCredential: MD

Location Address111 CLOCK TOWER CMNSBrewster, NY 10509-4055

Mailing Address111 Clock Tower CmnsBrewster, NY 10509-4055 · (845) 279-5187 · Fax (855) 703-7570

Phone(845) 279-5187

Fax(855) 703-7570

Sole ProprietorYes

Medical School CMSOtherGraduated 1981

Enumeration DateNovember 20, 2006

Last NPPES UpdateJanuary 28, 20263 updates tracked since enumeration

NPPES CertifiedJanuary 28, 2026

✔ NPI 1659445427 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians

Taxonomy Code207RE0101X

License✔ Licensed in NY · 161375

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.

111 CLOCK TOWER CMNS, Brewster, NY 10509

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Secondary Practice Locations 4

Location 1129 Clove Branch RdHopewell Junction, NY 12533-5284 · Phone (845) 279-5187 · Fax (855) 703-7570

Location 2888 Route 6Mahopac, NY 10541-6201 · Phone (845) 628-1492 · Fax (855) 703-7570

Location 3667 Stoneleigh Ave Ste 117Carmel, NY 10512-2455 · Phone (845) 279-5136 · Fax (855) 703-7570

Location 4260 AVENUE XBROOKLYN, NY 11223-5940 · Phone (718) 336-8855 · Fax (718) 336-4366

Other Identifiers 2

Medicaid01013432NY

Other161375NY · Nys License

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. Sadhis Rivas 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 ID840281317

PECOS Enrollment IDI20040522000008

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 Sadhis Rivas reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Northern Medical Group, PLLC

Same address

Internal Medicine

111 CLOCK TOWER CMNS
Brewster, NY 10509

Reassigned Medicare billing, New York enrollment
39 clinicians in this Medicare group

NPI 1174994826 (845) 279-5187

M2 Medical Community Practice, P.C.

58 mi

Internal Medicine

4802 10TH AVE
Brooklyn, NY 11219

Reassigned Medicare billing, New York enrollment
Medicare enrollment name: M2 Medical Community Practice PC
5 clinicians in this Medicare group

NPI 1114320397 (718) 283-6000

Maimonides Faculty Practice Plan

58 mi

Internal Medicine

4802 10TH AVE
Brooklyn, NY 11219

Reassigned Medicare billing, New York enrollment
1,177 clinicians in this Medicare group

NPI 1053344846 (718) 283-8700

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 22

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.

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

312 services175 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

312 services193 patients

Blood test, thyroid stimulating hormone (tsh) 84443

A TSH blood test measures the level of thyroid stimulating hormone in your body. This hormone is produced by the pituitary gland and regulates how your thyroid works. It's a simple procedure where a small amount of blood is drawn from your arm for analysis.

157 services108 patients

Blood test, comprehensive group of blood chemicals 80053

A comprehensive group of blood chemicals test, also known as a comprehensive metabolic panel, is a blood test that measures your sugar level, electrolyte and fluid balance, kidney function, and liver function. This helps to check your body's overall health.

141 services107 patients

Hemoglobin a1c level 83036

Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.

109 services83 patients

Vitamin d-3 level 82306

A Vitamin D-3 level test measures the amount of Vitamin D-3, a crucial nutrient, in your body. This test helps identify if your levels are too low or too high. Low levels may lead to bone weakness, while high levels could harm your kidneys. It's a simple blood test.

108 services85 patients

Blood test, lipids (cholesterol and triglycerides) 80061

A lipid panel is a blood test that measures fats and fatty substances, such as cholesterol and triglycerides. These substances are used by your body as a source of energy. High levels can lead to health issues, including heart disease.

87 services66 patients

Thyroxine (thyroid chemical), free 84439

The Thyroxine (thyroid chemical), free test is a blood test that measures the level of free T4 in your body. T4 is a hormone produced by your thyroid gland and is essential for growth and metabolism. If your T4 levels are too high or too low, it could indicate a thyroid disorder.

79 services59 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.

72 services60 patients

Blood glucose (sugar) test performed by hand-held instrument 82962

A blood glucose test uses a handheld device to measure the amount of sugar in your blood. A small prick on your finger allows a drop of blood to be placed on a test strip, which is then read by the device. This helps monitor and manage diabetes effectively.

63 services50 patients

Thyroid hormone, t3 measurement, free 84481

The T3 measurement, free, is a blood test that checks the level of a hormone called triiodothyronine. This hormone is produced by your thyroid, a small gland in your neck. It plays a key role in regulating your body's metabolism and energy use.

56 services44 patients

Urine microalbumin (protein) level 82043

The urine microalbumin level test measures the amount of a protein called albumin in your urine. This test helps to detect early signs of kidney damage. High levels of albumin may suggest your kidneys aren't functioning properly. It's a simple, non-invasive test that involves providing a urine sample.

55 services50 patients

Creatinine level to test for kidney function or muscle injury 82570

A creatinine level test measures the amount of creatinine in your blood. This substance is a waste product from normal muscle use. Higher levels can indicate possible kidney dysfunction or muscle injury. This test helps monitor kidney health.

55 services50 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.

54 services48 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count 85025

A Complete Blood Cell Count is a common test that measures various components of the blood, including red cells (carry oxygen), white cells (fight infection), and platelets (help blood clot). An automated test ensures accuracy. The differential count provides detailed information about white cell types.

43 services36 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test 85027

A complete blood cell count (CBC) is an automated test that measures different components of the blood, including red cells, white cells, and platelets. It helps assess overall health, detect disorders like anemia or infection, and monitor medical treatments.

41 services36 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.

26 services26 patients

Cyanocobalamin (vitamin b-12) level 82607

A Cyanocobalamin (Vitamin B-12) level test is a blood test that checks the amount of Vitamin B-12 in your body. This vitamin is vital for nerve function and the creation of red blood cells. Low or high levels could indicate a potential health issue.

24 services22 patients

Folic acid level, serum 82746

A Folic Acid Level, Serum test measures the amount of folic acid, a type of B vitamin, in your blood. This vitamin is important for cell growth and development. It's crucial for your body to function well. If your levels are low, it may indicate a deficiency, which can lead to health issues.

19 services17 patients

Parathormone (parathyroid hormone) level 83970

The Parathormone level test measures the amount of parathyroid hormone in your blood. This hormone controls calcium and phosphorus levels in the body, which are vital for bone health. Abnormal levels may indicate issues like kidney disease or parathyroid gland disorders.

19 services17 patients

Kidney function blood test panel 80069

A kidney function blood test panel checks how well your kidneys are working. It measures levels of various substances in your blood, including proteins, electrolytes, and waste products. The results can help detect potential kidney issues early.

17 services15 patients

Calcium level, total 82310

A total calcium level test measures the amount of calcium in your blood. Calcium is essential for body functions like bone formation, nerve signal transmission, and muscle contraction. Abnormal levels may indicate conditions like bone disease or kidney disorders.

16 services13 patients

Hospital Affiliations CMS Care Compare

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

Putnam Hospital Center

Acute Care Hospitals · Carmel, NY

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330273

Location670 Stoneleigh AvenueCarmel, NY 10512 · Putnam County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10509 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

$141.77 typical visit price

range $61.88 – $187.05

Typical copayment $35.44 (range $15.47 – $46.76)

Most-billed visit code 99204

Established Patient

$108.56 typical visit price

range $19.92 – $151.94

Typical copayment $27.14 (range $4.98 – $37.98)

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 4

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

25 suppliers95 claims357 services$5.88 avg. paid by Medicare

Normal, low and high calibrator solution / chips A4256

DME-Other DME · category DE000N

3 suppliers14 claims14 services$2.95 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

15 suppliers43 claims72 services$1.15 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

11 suppliers84 claims84 services$191.60 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 20

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

DR. MARCIE LYNN WOLINSKY-FRIEDLAND M.D.

Internal Medicine (Rheumatology)