Dr. Jessica Siak, MD
- Medicare services, 2024
- 909
- Medicare patients, 2024
- 277
- Part D claims, 2024
- 377
- Publications
- 1
- Hospital affiliations
- 2
- Practice address
- 3330 Lomita Blvd, Torrance, CA 90509
- Practice phone
- Call (310) 325-9110
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Siak'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. Jessica Siak is a hospitalist in Torrance, California
Dr. Siak practices at Torrance Memorial Medical Center in Torrance, California, part of Cedars-Sinai Health System.
Dr. Siak's NPI, 1174059570, was assigned on May 4, 2017. Dr. Siak holds California license A161511.
- NPI
- 1174059570NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961829163
- NPI enumeration date
- May 4, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 325-9110
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jessica Siak practices at Torrance Memorial Medical Center in Torrance, California
Dr. Siak's primary practice is Torrance Memorial Medical Center, at 3330 Lomita Blvd, Torrance, CA 90509 in Los Angeles County. The practice phone is (310) 325-9110.
- Torrance Memorial Medical Center3330 Lomita Blvd, Torrance, CA 90509 · Los Angeles CountyPhone(310) 325-9110
Source: Dmand AI Affiliation Data
Dr. Jessica Siak is affiliated with 3 sites of care and 2 medical groups
Dr. Siak's primary practice is Torrance Memorial Medical Center in Torrance, California, part of Cedars-Sinai Health System. Dr. Siak is also affiliated with Cedars-Sinai Medical Center. The medical group on file is Torrance Memorial Physician Network. Dmand AI also links Dr. Siak to 1 more skilled nursing facility and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jessica Siak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siak practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Torrance Memorial Medical Center | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jessica Siak is one of 3,186 hospitalists in California
Hospitalist is Dr. Siak's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Siak is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Hospitalists near Dr. Siak
Counts of hospitalists 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. Jessica Siak billed Medicare for 909 services in 2024
CMS data shows 909 Medicare services from Dr. Siak across 4 procedure codes in 2024, for 277 Medicare patients. Medicare paid $88,630 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Siak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7512024: 90921%
Dr. Siak compared with the California median for hospitalists, 2024
- Dr. Siak
- California median
- Medicare services
- 909vs 4302.1 times
- Medicare patients
- 277vs 20138% above
- Part D claims
- 125vs 6981% above
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Siak'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jessica Siak treated 277 Medicare patients in 2024, average age 78
CMS counts 277 Medicare patients who saw Dr. Siak in 2024. The largest group is 75 to 84, with 99 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 29% are also on Medicaid. Their average risk score is 2.84, 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. Siak's median patient age at 65, with 57% women.
Dr. Siak's Medicare patients by age, 2024
Dr. Siak's Medicare patients by sex, 2024
- Women14954%
- Men12846%
Chronic conditions among Dr. Siak's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Chronic kidney disease54%
- Diabetes49%
- Heart failure42%
- Atrial fibrillation40%
- Ischemic heart disease40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Siak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jessica Siak wrote 377 Medicare Part D claims in 2024
In 2024, Dr. Siak wrote 377 Medicare Part D claims for 182 patients. 84% of them were for generic drugs. CMS names the drug for 125 of them, across 7 drugs with 11 or more claims each, at $8,640 in total drug cost. In 2023, CMS named 147 claims across 10 drugs.
Dr. Siak's Part D claims by kind of drug, 2024
- Generic317 claims84%
- Brand-name and other60 claims16%
Dr. Siak'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. Siak's Part D claims, 2024
- Opioids6%22 of 377 claims
- Antibiotics22%83 of 377 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: 1472024: 12515%
Drugs named by CMS: 7 in 2024, 10 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. Jessica Siak takes part in Medicare
Dr. Siak accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jessica Siak has 1 publication on record
Dmand AI links 1 paper to Dr. Siak in 2020. Dr. Siak's most frequent co-authors are Florian Rader, MD and Robert J. Siegel, MD.
Dr. Siak's most frequent co-authors
Recent publications by Dr. Siak
See who Dr. Siak researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Siak works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Jessica Siak received $2,009 in industry payments from 2022 to 2025
CMS Open Payments shows 100 general payments to Dr. Siak from 16 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Abiomed paid the most, $382.
General payments to Dr. Siak by program year, 2022 to 2025
Companies that paid Dr. Siak the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Jessica Siak'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 DataDmand AI Org Hierarchy 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Jessica Siak
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. Jessica Siak's NPI number?
Dr. Jessica Siak's NPI number is 1174059570. It was assigned on May 4, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Jessica Siak?
Dr. Jessica Siak is a hospitalist in Torrance, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Jessica Siak practice?
Dr. Siak practices at 3330 Lomita Blvd, Torrance, CA 90509. Dr. Siak's primary practice is Torrance Memorial Medical Center in Torrance, California, part of Cedars-Sinai Health System. Dmand AI also links Dr. Siak to 1 skilled nursing facility and 1 medical group.
What is Dr. Jessica Siak's office phone number?
The practice phone on file for Dr. Siak is (310) 325-9110.
What is Dr. Jessica Siak's medical license number?
Dr. Siak holds California license A161511.
Which hospitals is Dr. Jessica Siak affiliated with?
Dr. Siak practices at Torrance Memorial Medical Center in Torrance, California. Dr. Siak is also affiliated with Cedars-Sinai Medical Center.
What medical group is Dr. Jessica Siak part of?
Dr. Siak is linked to Torrance Memorial Physician Network. Dmand AI links Dr. Siak to 1 more medical group.
Does Dr. Jessica Siak accept Medicare?
Yes. CMS data shows Dr. Siak billed Medicare for 909 services in 2024, and Dr. Siak accepts Medicare assignment.
How many Medicare patients does Dr. Jessica Siak see?
CMS counts 277 Medicare patients who saw Dr. Siak in 2024, with an average age of 78.
What services does Dr. Jessica Siak bill to Medicare?
In 2024, Dr. Siak's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99239) and hospital inpatient care (99223).
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What drugs does Dr. Jessica Siak prescribe most?
In 2024 Medicare Part D data, Dr. Siak's most prescribed drugs by claims were Cefdinir, Atorvastatin Calcium and Prednisone.
Has Dr. Jessica Siak received payments from drug or device companies?
CMS Open Payments shows $2,009 in general payments to Dr. Siak from 16 companies from 2022 to 2025. The largest total came from Abiomed.
How long has Dr. Jessica Siak been practicing?
Dr. Siak graduated from medical school in 2017, 9 years ago.
Does Dr. Jessica Siak do research?
Dmand AI links 1 publication to Dr. Siak.
Who does Dr. Jessica Siak publish with?
Dr. Siak's most frequent co-authors are Florian Rader, MD (1 shared paper) and Robert J. Siegel, MD (1 shared paper).
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