Dr. John S. Kellogg, MD, MS
- Medicare services, 2024
- 3,608
- Medicare patients, 2024
- 169
- Part D claims, 2024
- 539
- Hospital affiliations
- 1
- Industry payments
- $21,013
- Practice address
- 973 University Ave, Los Gatos, CA 95032
- Practice phone
- Call (408) 286-1744
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
South Bay Allergy & Asthma Group Inc
Los Gatos, California
Find Dr. Kellogg's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John S. Kellogg is an allergy physician in Los Gatos, California
Dr. Kellogg practices at South Bay Allergy & Asthma Group Inc in Los Gatos, California.
Dr. Kellogg's NPI, 1932149697, was assigned on June 8, 2006. Dr. Kellogg graduated from Tulane School of Medicine in 1993. Dr. Kellogg holds California license A54166.
- NPI
- 1932149697NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012923519
- NPI enumeration date
- June 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (408) 286-1744
- 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. John S. Kellogg practices at South Bay Allergy & Asthma Group Inc in Los Gatos, California
Dr. Kellogg's primary practice is South Bay Allergy & Asthma Group Inc, at 973 University Ave, Los Gatos, CA 95032 in Santa Clara County. The practice phone is (408) 286-1744.
- South Bay Allergy & Asthma Group Inc973 University Ave, Los Gatos, CA 95032 · Santa Clara CountyPhone(408) 286-1744
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John S. Kellogg is affiliated with 4 sites of care and 2 medical groups
Dr. Kellogg's primary practice is South Bay Allergy & Asthma Group Inc in Los Gatos, California. Dr. Kellogg is also affiliated with El Camino Health - Mountain View Hospital. The medical group on file is El Camino Health Medical Network. Dmand AI also links Dr. Kellogg to 2 more group practices and clinics 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. John S. Kellogg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kellogg practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| South Bay Allergy & Asthma Group Inc | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John S. Kellogg is one of 136 allergy physicians in California
Allergy is Dr. Kellogg's primary specialty in the NPI Registry, under taxonomy code 207KA0200X. Dr. Kellogg is board certified in allergy & immunology by the American Board of Allergy and Immunology. Dmand AI has Dr. Kellogg's licenses on file in 2 states: California and Hawaii.
Specialties and state licenses
- Allergy, CaliforniaPrimary
- Hawaii license
Clinical focus
Dmand AI lists acute sinusitis, asthma, chronic nasal allergies, chronic sinusitis, hives and immune deficiency disease among the conditions Dr. Kellogg treats.
Allergy physicians near Dr. Kellogg
Counts of allergy 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. John S. Kellogg billed Medicare for 3,608 services in 2024
CMS data shows 3,608 Medicare services from Dr. Kellogg across 10 procedure codes in 2024, for 169 Medicare patients. Medicare paid $72,971 for them. Every service was in an office.
Dr. Kellogg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 4,5832024: 3,28228%
- Office and hospital visits
- 2023: 3232024: 3261%
Dr. Kellogg compared with the California median for allergy physicians, 2024
- Dr. Kellogg
- California median
- Medicare services
- 3,608vs 2,33455% above
- Medicare patients
- 169vs 168Close to median
- Part D claims
- 397vs 21585% above
Medians across 123 allergy physicians in California with Dmand AI profiles that report each measure.
Dr. Kellogg's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Kellogg?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Kellogg and other allergy physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John S. Kellogg treated 169 Medicare patients in 2024, average age 75
CMS counts 169 Medicare patients who saw Dr. Kellogg in 2024. The largest group is 65 to 74, with 90 patients. 75% of them have high cholesterol, and 66% have high blood pressure. 9% are also on Medicaid. Their average risk score is 0.92, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Kellogg's median patient age at 40, with 46% women.
Dr. Kellogg's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Kellogg's Medicare patients by sex, 2024
- Women10763%
- Men6237%
Chronic conditions among Dr. Kellogg's Medicare patients, 2024
- High cholesterol75%
- High blood pressure66%
- Arthritis46%
- Asthma43%
- Diabetes28%
- Ischemic heart disease27%
- Osteoporosis26%
- Anxiety20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Kellogg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 40
Patient panel by sex, all payers
- Women46%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John S. Kellogg wrote 539 Medicare Part D claims in 2024
In 2024, Dr. Kellogg wrote 539 Medicare Part D claims for 107 patients. 55% of them were for generic drugs. CMS names the drug for 397 of them, across 19 drugs with 11 or more claims each, at $251,529 in total drug cost. In 2023, CMS named 292 claims across 13 drugs.
Dr. Kellogg's Part D claims by kind of drug, 2024
- Generic296 claims55%
- Brand-name243 claims45%
Dr. Kellogg'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. Kellogg's Part D claims, 2024
- Antibiotics6%31 of 539 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: 2922024: 39736%
Drugs named by CMS: 19 in 2024, 13 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
Dr. John S. Kellogg offers telehealth to Medicare patients
Dr. Kellogg accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Kellogg as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John S. Kellogg received $21,013 in industry payments from 2016 to 2025
CMS Open Payments shows 907 general payments to Dr. Kellogg from 42 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. GlaxoSmithKline, LLC. paid the most, $3,923.
General payments to Dr. Kellogg by program year, 2016 to 2025
General payments to Dr. Kellogg by kind, 2016 to 2025
- Food and beverage$20,55398%
- Education$4602%
Companies that paid Dr. Kellogg the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John S. Kellogg has 1 award and honors on record
Dmand AI lists 1 award for Dr. Kellogg, most recently CMS Stage 1 2012 in 2012.
Awards and honors for Dr. Kellogg
- 2012
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. John S. Kellogg graduated from Tulane School of Medicine
Dr. Kellogg graduated from Tulane School of Medicine in 1993. Dr. Kellogg is a member of AAAAI.
- Medical school
- Board certified in allergy & immunology
Source: Dmand AI Professional Profile Data
Dr. John S. Kellogg accepts plans from 16 insurance carriers
Dr. Kellogg is in network with 16 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Humana
- Regence Health Plans
- +8 more carriersWith a free account
Plan types Dr. Kellogg accepts, by number of carriers
- PPO11
- Medicare9
- HMO6
- POS5
- EPO4
Source: Dmand AI Insurance Network Data
Sources for Dr. John S. Kellogg'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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. John S. Kellogg
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. John S. Kellogg's NPI number?
Dr. John S. Kellogg's NPI number is 1932149697. It was assigned on June 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John S. Kellogg?
Dr. John S. Kellogg is an allergy physician in Los Gatos, California. The primary specialty in the NPI Registry is Allergy Physician (taxonomy code 207KA0200X).
Where does Dr. John S. Kellogg practice?
Dr. Kellogg practices at 973 University Ave, Los Gatos, CA 95032. Dr. Kellogg's primary practice is South Bay Allergy & Asthma Group Inc in Los Gatos, California. Dmand AI also links Dr. Kellogg to 2 group practices and clinics and 1 medical group.
What is Dr. John S. Kellogg's office phone number?
The practice phone on file for Dr. Kellogg is (408) 286-1744.
What is Dr. John S. Kellogg's medical license number?
Dr. Kellogg holds California license A54166, one of the licenses on file in 2 states.
Which states has Dr. John S. Kellogg been licensed in?
Dmand AI has state licenses on file for Dr. Kellogg in California (1995 to 2027) and Hawaii (1995).
Which hospitals is Dr. John S. Kellogg affiliated with?
Dr. Kellogg is affiliated with El Camino Health - Mountain View Hospital.
What medical group is Dr. John S. Kellogg part of?
Dr. Kellogg is linked to El Camino Health Medical Network. Dmand AI links Dr. Kellogg to 1 more medical group.
Does Dr. John S. Kellogg accept Medicare?
Yes. CMS data shows Dr. Kellogg billed Medicare for 3,608 services in 2024, and Dr. Kellogg accepts Medicare assignment.
Does Dr. John S. Kellogg offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Kellogg as offering telehealth services.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. John S. Kellogg see?
CMS counts 169 Medicare patients who saw Dr. Kellogg in 2024, with an average age of 75.
Is Dr. John S. Kellogg board certified?
Yes. Dr. Kellogg is board certified in allergy & immunology by the American Board of Allergy and Immunology.
What services does Dr. John S. Kellogg bill to Medicare?
In 2024, Dr. Kellogg's most billed Medicare services were allergy test or treatment (95165), allergy test or treatment (95004) and allergy test or treatment (95117).
Where did Dr. John S. Kellogg go to medical school?
Dr. Kellogg graduated from Tulane School of Medicine in 1993.
What drugs does Dr. John S. Kellogg prescribe most?
In 2024 Medicare Part D data, Dr. Kellogg's most prescribed drugs by claims were Ipratropium Bromide, Montelukast Sodium and Trelegy Ellipta.
Has Dr. John S. Kellogg received payments from drug or device companies?
CMS Open Payments shows $21,013 in general payments to Dr. Kellogg from 42 companies from 2016 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. John S. Kellogg been practicing?
Dr. Kellogg graduated from medical school in 1993, 33 years ago.
What insurance does Dr. John S. Kellogg accept?
Dr. Kellogg is in network with 16 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
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