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Dr. Mark Stephen Singer, MD
NPI1962486332PAC ID7911975750
- Medicare services, 2024
- 1,103
- Medicare patients, 2024
- 200
- Part D claims, 2024
- 3,444
- Publications
- 6
- Hospital affiliations
- 1
- Practice address
- 1900 Atrium Parkway, Napa, CA 94559
- Practice phone
- Call (707) 257-7885
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
The Meadows of Napa Valley
Skilled Nursing Facility - Part of a CCRC · Napa, California
Find Dr. Singer's professional email, personal email and mobile number
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Dr. Mark Stephen Singer is an internist in Napa, California
Dr. Singer practices at The Meadows of Napa Valley in Napa, California.
Dr. Singer's NPI, 1962486332, was assigned on November 30, 2005. Dr. Singer graduated from David Geffen School of Medicine at UCLA in 1983. Dr. Singer's California license number on file is G53924.
NPI and contact details
- NPI
- 1962486332NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7911975750
- NPI enumeration date
- November 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 257-7885
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Stephen Singer practices at The Meadows of Napa Valley in Napa, California
Dr. Singer's primary practice is The Meadows of Napa Valley, at 1900 Atrium Parkway, Napa, CA 94559 in Napa County. The practice phone is (707) 257-7885.
- The Meadows of Napa Valley1900 Atrium Parkway, Napa, CA 94559 · Napa CountyPhone(707) 257-7885
Source: Dmand AI Affiliation Data
Dr. Mark Stephen Singer is affiliated with 6 sites of care
Dr. Singer's primary practice is The Meadows of Napa Valley in Napa, California. Dr. Singer is also affiliated with Providence Queen of the Valley Medical Center. Dmand AI also links Dr. Singer to 3 more home health agencies and 1 hospice, each named with a free account. Dr. Singer's employer is on file too: a skilled nursing facility.
The Meadows of Napa ValleyPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Stephen Singer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Singer practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Meadows of Napa Valley | Available with a free account |
| +5 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Stephen Singer is one of 16,751 internists in California
Internal medicine is Dr. Singer's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Singer is board certified in internal medicine by the American Board of Internal Medicine. Dr. Singer has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, alzheimer's disease, anxiety, arteritis, arthritis, atrial fibrillation and flutter, benign or precancerous skin growths and bladder disease among the conditions Dr. Singer treats.
Internists near Dr. Singer
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. Mark Stephen Singer billed Medicare for 1,103 services in 2024
CMS data shows 1,103 Medicare services from Dr. Singer across 13 procedure codes in 2024, for 200 Medicare patients. Medicare paid $108,924 for them.
Medicare services, 20241,103
Medicare patients200
Paid by Medicare$108,924
Procedure codes13
Dr. Singer's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9672024: 1,0044%
- Other services
- 2023: 572024: 6718%
- Surgery
- 2023: 262024: 1735%
- Tests and treatments
- 2023: 172024: 1512%
Where Dr. Singer's Medicare services took place, 2024
- In an office67861%
- In a facility42539%
Dr. Singer compared with the California median for internists, 2024
- Dr. Singer
- California median
- Medicare services
- 1,103vs 3613.1 times
- Medicare patients
- 200vs 15132% above
- Part D claims
- 2,873vs 4216.8 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Singer'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. Mark Stephen Singer treated 200 Medicare patients in 2024, average age 85
CMS counts 200 Medicare patients who saw Dr. Singer in 2024. The largest group is 85 and over, with 108 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 1.92, 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. Singer's median patient age at 87, with 68% women.
Medicare patients, 2024200
Average age85
Average risk score1.92
Also on Medicaid18%
Dr. Singer's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Singer's Medicare patients by sex, 2024
- Women13065%
- Men7035%
Chronic conditions among Dr. Singer's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis64%
- Alzheimer's and dementia52%
- Mood disorders52%
- Depression44%
- Heart failure43%
- Ischemic heart disease42%
Share of Medicare patients with each condition. A patient can have several.
Dr. Singer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 87
Patient panel by sex, all payers
- Women68%
- Men32%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Stephen Singer wrote 3,444 Medicare Part D claims in 2024
In 2024, Dr. Singer wrote 3,444 Medicare Part D claims for 160 patients. 84% of them were for generic drugs. CMS names the drug for 2,873 of them, across 79 drugs with 11 or more claims each, at $183,907 in total drug cost. In 2023, CMS named 2,369 claims across 65 drugs.
Part D claims, 20243,444
Drugs named by CMS79
Total drug cost$183,907
Part D patients160
Dr. Singer's Part D claims by kind of drug, 2024
- Generic2,902 claims84%
- Brand-name and other542 claims16%
Dr. Singer'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. Singer's Part D claims, 2024
- Opioids4%142 of 3,444 claims
- Antibiotics3%101 of 3,444 claims
- Antipsychotics, patients 65 and over3%112 of 3,444 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: 2,3692024: 2,87321%
Drugs named by CMS: 79 in 2024, 65 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. Mark Stephen Singer ranks in the 59th percentile for removal of skin lesions in Medicare
Dr. Singer accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 12 procedures of removal of skin lesions by Dr. Singer, more than 59% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Singer ranks in Medicare procedure volume
- Removal of skin lesions
- 59th percentile12 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mark Stephen Singer has 6 publications on record
Dmand AI links 6 papers to Dr. Singer, published from 2010 to 2021. The most frequent topics are Sulfatases, Enzyme-Linked Immunosorbent Assay and Sulfotransferases. Dr. Singer's most frequent co-authors are Steven T. Rosen, MD, Bruce Davidson and Suzette Genevieve Miranda, MD.
Papers6
Years published2010 to 2021
Dr. Singer's papers by year, 2010 to 2021
Topics Dr. Singer writes about most
- Sulfatases
- Enzyme-Linked Immunosorbent Assay
- Sulfotransferases
Dr. Singer's most frequent co-authors
- Steven T. Rosen, MD3 shared papers
- Bruce Davidson1 shared paper
- Suzette Genevieve Miranda, MD1 shared paper
Recent publications by Dr. Singer
Enzyme-Linked Immunosorbent AssayFibrosisReference Values
See who Dr. Singer researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Singer works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark Stephen Singer graduated from David Geffen School of Medicine at UCLA
Dr. Singer graduated from David Geffen School of Medicine at UCLA in 1983.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Mark Stephen Singer accepts plans from 4 insurance carriers
Dr. Singer is in network with 4 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Regence Health Plans
Plan types Dr. Singer accepts, by number of carriers
- Medicare4
- PPO4
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark Stephen Singer'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)Doctors and Clinicians Utilization Data (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 |
| 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. Mark Stephen Singer
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. Mark Stephen Singer's NPI number?
Dr. Mark Stephen Singer's NPI number is 1962486332. It was assigned on November 30, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Stephen Singer?
Dr. Mark Stephen Singer is an internist in Napa, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Stephen Singer practice?
Dr. Singer practices at 1900 Atrium Parkway, Napa, CA 94559. Dr. Singer's primary practice is The Meadows of Napa Valley in Napa, California. Dmand AI also links Dr. Singer to 3 home health agencies and 1 hospice.
What is Dr. Mark Stephen Singer's office phone number?
The practice phone on file for Dr. Singer is (707) 257-7885.
What is Dr. Mark Stephen Singer's medical license number?
Dr. Singer's California license number on file is G53924.
Which hospitals is Dr. Mark Stephen Singer affiliated with?
Dr. Singer is affiliated with Providence Queen of the Valley Medical Center.
Does Dr. Mark Stephen Singer accept Medicare?
Yes. CMS data shows Dr. Singer billed Medicare for 1,103 services in 2024, and Dr. Singer accepts Medicare assignment.
How many Medicare patients does Dr. Mark Stephen Singer see?
CMS counts 200 Medicare patients who saw Dr. Singer in 2024, with an average age of 85.
Is Dr. Mark Stephen Singer board certified?
Yes. Dr. Singer is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Mark Stephen Singer bill to Medicare?
In 2024, Dr. Singer's most billed Medicare services were home visit (99349), nursing facility care (99308) and nursing facility care (99306).
Show 6 more questionsShow fewer questions
Where did Dr. Mark Stephen Singer go to medical school?
Dr. Singer graduated from David Geffen School of Medicine at UCLA in 1983.
What drugs does Dr. Mark Stephen Singer prescribe most?
In 2024 Medicare Part D data, Dr. Singer's most prescribed drugs by claims were Levothyroxine Sodium, Eliquis and Atorvastatin Calcium.
How long has Dr. Mark Stephen Singer been practicing?
Dr. Singer graduated from medical school in 1983, 43 years ago.
Does Dr. Mark Stephen Singer do research?
Dmand AI links 6 publications to Dr. Singer, published from 2010 to 2021.
Who does Dr. Mark Stephen Singer publish with?
Dr. Singer's most frequent co-authors are Steven T. Rosen, MD (3 shared papers), Bruce Davidson (1 shared paper) and Suzette Genevieve Miranda, MD (1 shared paper).
What insurance does Dr. Mark Stephen Singer accept?
Dr. Singer is in network with 4 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
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