Physician Profile
Jeffrey R. Unger, M.D.
Unclaimed ProfileAbout Dr. Unger
Based in Rancho Cucamonga, CA, Jeffrey R. Unger, M.D. is listed in the NPI registry under endocrinology, diabetes & metabolism. Jeffrey graduated from Northwestern University Feinberg Medical School in 1980. Jeffrey is also listed as specializing in family medicine. According to Medicare claims data, Jeffrey cared for 354 Medicare patients across 820 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (909) 590-8409
- Email not available
Practice Locations
9220 HAVEN AVE STE 230
Rancho Cucamonga, CA 91730
Conditions Commonly Evaluated or Treated
Within Endocrinology, Diabetes and Metabolism generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Diabetes
- Hyperthyroidism
- Hypothyroidism
- Obesity
- Osteoporosis
- PCOS
- Thyroid problems
Adrenal
- Low sodium or electrolyte imbalance
Adrenal disorders
- Adrenal Fatigue
- Adrenal gland tumor
- Adrenal mass
- Cushing's Syndrome
Blood sugar disorders
- Diabetic neuropathy
- Gestational diabetes
- Low Blood Sugar
- Prediabetes
Bone and calcium disorders
- High calcium
- Low Calcium
- Vitamin D deficiency
Bones
- Soft Bones
Diabetes
- Dangerous high blood sugar
- Diabetic retinopathy
- Kidney disease from diabetes
Endocrine tumors
- Neuroendocrine Tumors
Hormone disorders
- Early or delayed puberty
- Excess facial or body hair
- Gynecomastia
- Perimenopause
- Testosterone deficiency
Hormones
- Absent periods
Metabolic disorders
- High cholesterol
- Metabolic syndrome
Metabolism
- Fatty liver disease
- Insulin Resistance
- Unexplained Weight Gain
Parathyroid
- Hyperparathyroidism
Pituitary
- Acromegaly
- Adult Growth Hormone Deficiency
- Underactive Pituitary Gland
Pituitary disorders
- Extreme Thirst and Urination
- High Prolactin
- Pituitary Tumor
- Short stature and growth concerns
Thyroid
- Thyroiditis
Thyroid disorders
- Goiter
- Graves' Disease
- Hashimoto's Disease
- Thyroid cancer
- Thyroid eye disease
- Thyroid nodules
Procedures & services
Most searched procedures
- Hormone replacement therapy
- Insulin pump management
- Thyroid ultrasound
- Weight loss management
Adrenal
- 24-Hour Urine Cortisol Test
- Aldosterone and Renin Blood Test
- Urine Metanephrines Test
Adrenal evaluations
- Adrenal Gland Suppression Test
- Cortisol Testing
Blood sugar management
- Continuous Glucose Monitor Placement
- Diabetes Screening and A1C Test
- Glucose screening test
Bone evaluations
- Bone Density Scan Referral
- Parathyroid Hormone Test
Bone treatments
- Bisphosphonate Infusion for Bones
- Bone Building Injections
Diabetes
- Automated Insulin System Setup
- Blood Ketone Monitoring
- C-Peptide Test
- Continuous Glucose Monitor Data Review
- Medical nutrition therapy
- Starting Insulin Therapy
Diabetes education
- Diabetes Self-Management Education
Diabetes preventive care
- Diabetic Foot Care
Genetic evaluations
- Genetic Testing for Endocrine Tumors
Hormone treatments
- Estrogen and Progesterone Therapy
- Growth Hormone Injections
- Hormone Replacement Therapy Consultation
Hormones
- Gender-affirming care consultation
Metabolic evaluations
- Cholesterol and Lipid Blood Panel
Metabolism
- Fasting Insulin Test
Parathyroid
- Parathyroid Scan
Pituitary
- Growth Hormone Stimulation Test
Pituitary evaluations
- Prolactin Blood Test
- Water Deprivation Test
Thyroid
- Thyroid Cyst Alcohol Ablation
- Thyroid Uptake and Scan
Thyroid procedures
- Radioactive Iodine Treatment
- Thyroid Antibody Testing
- Thyroid Blood Test
- Thyroid Medication Adjustment
- Thyroid Nodule Biopsy
- Thyroid Nodule Radiofrequency Ablation
Weight & Metabolism
- Weight loss medication consult
Procedures Most Often Billed to Medicare
820 services · 354 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
61 | Less often than most peers in Endocrinology, Diabetes &… |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
14 | Too few peers to compare |
| Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report | Treatment | 95251 |
90 | As often as other peers in Endocrinology, Diabetes &… |
| Influenza vaccine, trivalent derived from cell cultures | Treatment | 90661 |
23 | As often as other peers in Endocrinology, Diabetes &… |
| Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with provider supplied equipment | Treatment | 95250 |
15 | Less often than most peers in Endocrinology, Diabetes &… |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
15 | Less often than most peers in Endocrinology, Diabetes &… |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
11 | Less often than most peers in Endocrinology, Diabetes &… |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Drug given | J3301 |
63 | Too few peers to compare |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
254 | More than most peers in Endocrinology, Diabetes &… |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
164 | As often as other peers in Endocrinology, Diabetes &… |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Northwestern University Feinberg Medical School 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1980 at Northwestern University Feinberg Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Jeffrey R. Unger specialize in?
Jeffrey R. Unger is an endocrinologist in Rancho Cucamonga, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Endocrinology, Diabetes & Metabolism”.
NPI registry
Where is Jeffrey R. Unger located?
Jeffrey R. Unger is listed at 9220 Haven Ave Ste 230, Rancho Cucamonga, CA 91730. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Jeffrey R. Unger's phone number?
The number on file is (909) 590-8409. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Jeffrey R. Unger's NPI number?
Jeffrey R. Unger's National Provider Identifier is 1003856188. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Jeffrey R. Unger train?
Jeffrey R. Unger attended Northwestern University Feinberg Medical School, graduating in 1980. This comes from the CMS National Downloadable File.
CMS public data
How long has Jeffrey R. Unger been practicing?
Jeffrey R. Unger has 46 years experience. Calculated from a graduation year of 1980, reported in the CMS National Downloadable File.
CMS public data
What does Jeffrey R. Unger do most often?
According to Medicare billing data, Jeffrey R. Unger performs procedures including insertion of needle into vein for collection of blood sample and aspiration and/or injection of fluid from large joint; provides treatments such as continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report and influenza vaccine, trivalent derived from cell cultures, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Jeffrey R. Unger confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Jeffrey R. Unger. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.