Dr. Siamak N. Nabili, MD
- Medicare services, 2023
- 255
- Part D claims, 2024
- 275
- Hospital affiliations
- 1
- Industry payments
- $196
- Medical groups
- 4
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-2447
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mission Hospital - Unit
Acute Care Hospital-Unit · Mission Viejo, California
Find Dr. Nabili'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. Siamak N. Nabili is an internist in Mission Viejo, California
Dr. Nabili practices at Mission Hospital - Unit in Mission Viejo, California.
Dr. Nabili's NPI, 1407892490, was assigned on June 20, 2006. Dr. Nabili graduated from St. George's University School of Medicine in 2001. Dr. Nabili holds California license A83984.
- NPI
- 1407892490NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7719953876
- NPI enumeration date
- June 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Siamak N. Nabili practices at Mission Hospital - Unit in Mission Viejo, California
Dr. Nabili's primary practice is Mission Hospital - Unit, at 27700 Medical Center Rd, Mission Viejo, CA 92691 in Orange County. The practice phone is (949) 365-2447.
- Mission Hospital - Unit27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 365-2447
Source: Dmand AI Affiliation Data
Dr. Siamak N. Nabili is affiliated with 6 sites of care and 4 medical groups
Dr. Nabili's primary practice is Mission Hospital - Unit in Mission Viejo, California. The medical group on file is Optum - Downtown Los Angeles. Dmand AI also links Dr. Nabili to 3 more group practices and clinics, 3 medical groups and 2 hospices, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Siamak N. Nabili's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nabili practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mission Hospital - Unit | Available with a free account |
| +5 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Siamak N. Nabili is one of 16,751 internists in California
Internal medicine is Dr. Nabili's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Nabili is board certified in hospice and palliative medicine by the American Board of Internal Medicine. Dmand AI has Dr. Nabili's licenses on file in 2 states: California and Nevada.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Nevada license
Clinical focus
Dmand AI lists acute diabetes, acute respiratory failure, cardiac arrhythmia, chest trauma, circulation problems, congestive heart failure, electrolyte disorders and gastrointestinal obstruction among the conditions Dr. Nabili treats.
Internists near Dr. Nabili
Counts of internists 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. Siamak N. Nabili billed Medicare for 255 services in 2023
CMS data shows 255 Medicare services from Dr. Nabili across 5 procedure codes in 2023. Medicare paid $18,951 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nabili's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 3252023: 25522%
Dr. Nabili compared with the California median for internists, 2023
- Dr. Nabili
- California median
- Medicare services
- 255vs 36129% below
- Part D claims
- 62vs 42185% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Nabili's most billed Medicare procedure codes, 2023
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. Nabili?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nabili and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Siamak N. Nabili's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Nabili's median patient age at 78, with 58% women.
Dr. Nabili's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women58%
- Men42%
Source: Dmand AI Patient Panel Data
Dr. Siamak N. Nabili wrote 275 Medicare Part D claims in 2024
In 2024, Dr. Nabili wrote 275 Medicare Part D claims for 120 patients. 92% of them were for generic drugs. CMS names the drug for 62 of them, across 4 drugs with 11 or more claims each, at $193 in total drug cost. In 2023, CMS named 90 claims across 6 drugs.
Dr. Nabili's Part D claims by kind of drug, 2024
- Generic252 claims92%
- Brand-name and other23 claims8%
Dr. Nabili'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. Nabili's Part D claims, 2024
- Opioids4%11 of 275 claims
- Antibiotics16%45 of 275 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: 902024: 6231%
Drugs named by CMS: 4 in 2024, 6 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
How Dr. Siamak N. Nabili takes part in Medicare
Dr. Nabili accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Siamak N. Nabili received $196 in industry payments from 2016 to 2024
CMS Open Payments shows 5 general payments to Dr. Nabili from 3 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $158.
General payments to Dr. Nabili by program year, 2016 to 2024
Companies that paid Dr. Nabili the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Siamak N. Nabili graduated from St. George's University School of Medicine
Dr. Nabili graduated from St. George's University School of Medicine in 2001.
- Medical school
- Board certified in hospice and palliative medicine
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Siamak N. Nabili accepts plans from 6 insurance carriers
Dr. Nabili is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Humana
Plan types Dr. Nabili accepts, by number of carriers
- Medicare5
- PPO5
- HMO3
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Siamak N. Nabili'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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 Data |
| 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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Siamak N. Nabili
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. Siamak N. Nabili's NPI number?
Dr. Siamak N. Nabili's NPI number is 1407892490. It was assigned on June 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Siamak N. Nabili?
Dr. Siamak N. Nabili is an internist in Mission Viejo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Siamak N. Nabili practice?
Dr. Nabili practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Dr. Nabili's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Dr. Nabili to 3 group practices and clinics, 3 medical groups and 2 hospices.
What is Dr. Siamak N. Nabili's office phone number?
The practice phone on file for Dr. Nabili is (949) 365-2447.
What is Dr. Siamak N. Nabili's medical license number?
Dr. Nabili holds California license A83984, one of the licenses on file in 2 states.
Which states has Dr. Siamak N. Nabili been licensed in?
Dmand AI has state licenses on file for Dr. Nabili in California (2003 to 2026) and Nevada (2016 to 2027).
What medical group is Dr. Siamak N. Nabili part of?
Dr. Nabili is linked to Optum - Downtown Los Angeles. Dmand AI links Dr. Nabili to 3 more medical groups.
Does Dr. Siamak N. Nabili accept Medicare?
Yes. CMS data shows Dr. Nabili billed Medicare for 255 services in 2023, and Dr. Nabili accepts Medicare assignment.
Is Dr. Siamak N. Nabili board certified?
Yes. Dr. Nabili is board certified in hospice and palliative medicine by the American Board of Internal Medicine.
What services does Dr. Siamak N. Nabili bill to Medicare?
In 2023, Dr. Nabili's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99239) and hospital inpatient care (99231).
Show 5 more questionsShow fewer questions
Where did Dr. Siamak N. Nabili go to medical school?
Dr. Nabili graduated from St. George's University School of Medicine in 2001.
What drugs does Dr. Siamak N. Nabili prescribe most?
In 2024 Medicare Part D data, Dr. Nabili's most prescribed drugs by claims were Amlodipine Besylate, Pantoprazole Sodium and Prednisone.
Has Dr. Siamak N. Nabili received payments from drug or device companies?
CMS Open Payments shows $196 in general payments to Dr. Nabili from 3 companies from 2016 to 2024. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Siamak N. Nabili been practicing?
Dr. Nabili graduated from medical school in 2001, 25 years ago.
What insurance does Dr. Siamak N. Nabili accept?
Dr. Nabili is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card