Dr. Nicolaas Martin Grobler Jr., MD
- Medicare services, 2024
- 1,795
- Medicare patients, 2024
- 396
- Part D claims, 2024
- 14,468
- Hospital affiliations
- 4
- Industry payments
- $12,798
- Practice address
- 9655 Monte Vista Ave, Montclair, CA 91763
- Practice phone
- Call (909) 591-6575
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Central Medical Group
Montclair, California
Find Dr. Grobler'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. Nicolaas Martin Grobler Jr. is a pulmonologist in Montclair, California
Dr. Grobler practices at Central Medical Group in Montclair, California.
Dr. Grobler's NPI, 1720154255, was assigned on November 27, 2006. Dr. Grobler holds California license A89047.
- NPI
- 1720154255NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8820160880
- NPI enumeration date
- November 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (909) 591-6575
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nicolaas Martin Grobler Jr. practices at Central Medical Group in Montclair, California
Dr. Grobler's primary practice is Central Medical Group, at 9655 Monte Vista Ave, Montclair, CA 91763 in San Bernardino County. The practice phone is (909) 591-6575.
- Central Medical Group9655 Monte Vista Ave, Montclair, CA 91763 · San Bernardino CountyPhone(909) 591-6575
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Nicolaas Martin Grobler Jr. is affiliated with 9 sites of care and 4 medical groups
Dr. Grobler's primary practice is Central Medical Group in Montclair, California. Dr. Grobler is also affiliated with Montclair Hospital Medical Center. The medical group on file is Inland Physicians Medical Group. Dmand AI also links Dr. Grobler to 3 more hospitals, 3 group practices and clinics, 3 medical groups and 1 home health agency, 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. Nicolaas Martin Grobler Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grobler practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Central Medical Group | Available with a free account |
| +8 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nicolaas Martin Grobler Jr. is one of 1,339 pulmonologists in California
Pulmonary disease is Dr. Grobler's primary specialty in the NPI Registry, under taxonomy code 207RP1001X. Dr. Grobler is licensed in California.
Specialties and state licenses
- Pulmonary disease, CaliforniaPrimary
Pulmonologists near Dr. Grobler
Counts of pulmonologists 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. Nicolaas Martin Grobler Jr. billed Medicare for 1,795 services in 2024
CMS data shows 1,795 Medicare services from Dr. Grobler across 16 procedure codes in 2024, for 396 Medicare patients. Medicare paid $160,911 for them.
Dr. Grobler's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,0422024: 1,58952%
- Tests and treatments
- 2023: 1382024: 1306%
- Other services
- 2023: 682024: 7612%
Where Dr. Grobler's Medicare services took place, 2024
- In an office1,09161%
- In a facility70439%
Dr. Grobler compared with the California median for pulmonologists, 2024
- Dr. Grobler
- California median
- Medicare services
- 1,795vs 6492.8 times
- Medicare patients
- 396vs 27246% above
- Part D claims
- 13,419vs 42131.9 times
Medians across 1,263 pulmonologists in California with Dmand AI profiles that report each measure.
Dr. Grobler'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grobler and other pulmonologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicolaas Martin Grobler Jr. treated 396 Medicare patients in 2024, average age 73
CMS counts 396 Medicare patients who saw Dr. Grobler in 2024. The largest group is 65 to 74, with 157 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 45% are also on Medicaid. Their average risk score is 2.56, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Grobler's median patient age at 67, with 48% women.
Dr. Grobler's Medicare patients by age, 2024
Dr. Grobler's Medicare patients by sex, 2024
- Women20051%
- Men19649%
Chronic conditions among Dr. Grobler's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis47%
- Diabetes45%
- Chronic kidney disease40%
- Heart failure39%
- COPD38%
- Ischemic heart disease38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grobler's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nicolaas Martin Grobler Jr. wrote 14,468 Medicare Part D claims in 2024
In 2024, Dr. Grobler wrote 14,468 Medicare Part D claims for 1,047 patients. 85% of them were for generic drugs. CMS names the drug for 13,419 of them, across 181 drugs with 11 or more claims each, at $1,632,779 in total drug cost. In 2023, CMS named 10,393 claims across 156 drugs.
Dr. Grobler's Part D claims by kind of drug, 2024
- Generic12,230 claims85%
- Brand-name2,094 claims14%
- Other144 claims1%
Dr. Grobler'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. Grobler's Part D claims, 2024
- Opioids3%373 of 14,468 claims
- Antibiotics3%501 of 14,468 claims
- Antipsychotics, patients 65 and over0%38 of 14,468 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: 10,3932024: 13,41929%
Drugs named by CMS: 181 in 2024, 156 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. Nicolaas Martin Grobler Jr. offers telehealth to Medicare patients
Dr. Grobler accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Grobler as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Nicolaas Martin Grobler Jr. received $12,798 in industry payments from 2016 to 2025
CMS Open Payments shows 564 general payments to Dr. Grobler from 54 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 96% of the total. GlaxoSmithKline, LLC. paid the most, $3,386.
General payments to Dr. Grobler by program year, 2016 to 2025
General payments to Dr. Grobler by kind, 2016 to 2025
- Food and beverage$12,22896%
- Education$3102%
- Travel and lodging$2362%
- Speaker and faculty fees$240%
Companies that paid Dr. Grobler the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nicolaas Martin Grobler Jr.'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) |
| 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. Nicolaas Martin Grobler Jr.
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. Nicolaas Martin Grobler Jr.'s NPI number?
Dr. Nicolaas Martin Grobler Jr.'s NPI number is 1720154255. It was assigned on November 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicolaas Martin Grobler Jr.?
Dr. Nicolaas Martin Grobler Jr. is a pulmonologist in Montclair, California. The primary specialty in the NPI Registry is Pulmonary Disease Physician (taxonomy code 207RP1001X).
Where does Dr. Nicolaas Martin Grobler Jr. practice?
Dr. Grobler practices at 9655 Monte Vista Ave, Montclair, CA 91763. Dr. Grobler's primary practice is Central Medical Group in Montclair, California. Dmand AI also links Dr. Grobler to 3 hospitals, 3 group practices and clinics, 3 medical groups and 1 home health agency.
What is Dr. Nicolaas Martin Grobler Jr.'s office phone number?
The practice phone on file for Dr. Grobler is (909) 591-6575.
What is Dr. Nicolaas Martin Grobler Jr.'s medical license number?
Dr. Grobler holds California license A89047.
Which hospitals is Dr. Nicolaas Martin Grobler Jr. affiliated with?
Dr. Grobler is affiliated with Montclair Hospital Medical Center. Dmand AI links Dr. Grobler to 3 more hospitals.
What medical group is Dr. Nicolaas Martin Grobler Jr. part of?
Dr. Grobler is linked to Inland Physicians Medical Group. Dmand AI links Dr. Grobler to 3 more medical groups.
Does Dr. Nicolaas Martin Grobler Jr. accept Medicare?
Yes. CMS data shows Dr. Grobler billed Medicare for 1,795 services in 2024, and Dr. Grobler accepts Medicare assignment.
Does Dr. Nicolaas Martin Grobler Jr. offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Grobler as offering telehealth services.
How many Medicare patients does Dr. Nicolaas Martin Grobler Jr. see?
CMS counts 396 Medicare patients who saw Dr. Grobler in 2024, with an average age of 73.
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What services does Dr. Nicolaas Martin Grobler Jr. bill to Medicare?
In 2024, Dr. Grobler's most billed Medicare services were office visit, established patient (99214), hospital inpatient care (99232) and nursing facility care (99309).
What drugs does Dr. Nicolaas Martin Grobler Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Grobler's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Nicolaas Martin Grobler Jr. received payments from drug or device companies?
CMS Open Payments shows $12,798 in general payments to Dr. Grobler from 54 companies from 2016 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Nicolaas Martin Grobler Jr. been practicing?
Dr. Grobler graduated from medical school in 2000, 26 years ago.
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