Michael S. Greenfield, M.D.
Endocrinology, Diabetes & Metabolism
Michael S. Greenfield is an Endocrinology, Diabetes & Metabolism specialist based in Mountain View, CA with over 52 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: INTERNAL MEDICINE
With over 52 years in internal medicine, Michael S. Greenfield, M.D. is a long-established endocrinology, diabetes & metabolism specialist in Mountain View. A Harvard Medical School graduate since 1974, he brings 52+ years of experience. CMS Medicare data shows his patients commonly have high cholesterol, hypertension, and diabetes.
Older · 6894dNPPES updated 2007-07-08 · verify NPI on CMS · Verify license at Medical Board of California
Contact & Location
Practice Location
2500 Hospital Dr Building 14, Mountain View, CA 94040-4106
How Does This Doctor Compare?
MIPS Score
202374.23/100
California avg: 78.6 · US avg: 83.6
⚠ Lower than most doctors nationally(-9.4 pts)
How the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Generic Rx
↑ Higher = better64.9%
California avg: 83.3 · US avg: 82.8
⚠ Lower than most doctors nationally(-17.9 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
221
Unique beneficiaries
Standard volumePrescription Recipients
224
Patients prescribed
Prescriptions Written
2,606
Total claims
Total Medicare drug cost: $1.04M
Percentile rankings compared against 9,360 reporting peers in California.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages High Cholesterol, Hypertension, and Diabetes.
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+4%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+21%) — a focus area for this doctor
Weakened bones that are more prone to fractures, common in older adults
US avg: 18.1%↑ More patients than average (+16%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-20%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↓ Fewer patients than average (-7%) — less common here
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-9%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$100 received from industry
6 transactions reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Michael S. Greenfield's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1974
Harvard Medical School
52 years in practice
Senior practitioner
Endocrinologists treat hormonal and metabolic disorders including diabetes (type 1 and 2), thyroid disease, osteoporosis, adrenal disorders, pituitary conditions, and polycystic ovary syndrome (PCOS).
Taxonomy: 207RE0101X
Education & Training
Harvard Medical School (Class of 1974)
Primary hospital affiliation: Psychiatric
CMS Certification Number: 194083
View hospital on Medicare Care CompareVirtual Endocrinology, Diabetes & Metabolism Care With Michael S. Greenfield
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Michael S. Greenfield for cholesterol management, blood pressure monitoring, diabetes check-ins — no travel to Mountain View required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Michael S. Greenfield
Dr. Greenfield is listed as active in the NPI registry with telehealth listed in Mountain View, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (650) 965-7500.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Michael S. Greenfield
Practice Location
2500 Hospital Dr Building 14, Mountain View, CA 94040-4106
Mailing Address
2500 Hospital Dr Building 14, Mountain View, CA 94040-4106
This is a provider directory. Contact the office directly to schedule appointments.
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