Dr. Joanna Sing-Ling Maack, MD
- Medicare services, 2024
- 328
- Medicare patients, 2024
- 287
- Part D claims, 2024
- 168
- Hospital affiliations
- 1
- Industry payments
- $184
- Practice address
- 475 Foothill Blvd, La Canada Flintridge, CA 91011
- Practice phone
- Call (818) 880-2225
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Exer Urgent Care
La Canada Flintridge, California
Find Dr. Maack'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. Joanna Sing-Ling Maack is an emergency medicine physician in La Canada Flintridge, California
Dr. Maack practices at Exer Urgent Care in La Canada Flintridge, California.
Dr. Maack's NPI, 1235381831, was assigned on October 15, 2008. Dr. Maack graduated from Icahn School Of Medicine At Mount Sinai in 2005. Dr. Maack holds California license A109849.
- NPI
- 1235381831NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446305890
- NPI enumeration date
- October 15, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (818) 880-2225
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Joanna Sing-Ling Maack practices at Exer Urgent Care in La Canada Flintridge, California
Dr. Maack's primary practice is Exer Urgent Care, at 475 Foothill Blvd, La Canada Flintridge, CA 91011 in Los Angeles County. The practice phone is (818) 880-2225.
- Exer Urgent Care475 Foothill Blvd, La Canada Flintridge, CA 91011 · Los Angeles CountyPhone(818) 880-2225
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Joanna Sing-Ling Maack is affiliated with 3 sites of care and 3 medical groups
Dr. Maack's primary practice is Exer Urgent Care in La Canada Flintridge, California. Dr. Maack is also affiliated with Huntington Hospital. The medical group on file is Exer Urgent Care. Dmand AI also links Dr. Maack to 2 more medical groups and 1 home health agency, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Joanna Sing-Ling Maack's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Maack practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Exer Urgent Care | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Joanna Sing-Ling Maack is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Maack's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Maack is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Maack's licenses on file in 2 states: California and New Jersey.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- New Jersey license
Emergency medicine physicians near Dr. Maack
Counts of emergency medicine 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. Joanna Sing-Ling Maack billed Medicare for 328 services in 2024
CMS data shows 328 Medicare services from Dr. Maack across 10 procedure codes in 2024, for 287 Medicare patients. Medicare paid $30,020 for them.
Dr. Maack's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1532024: 26171%
- Tests and treatments
- 2023: 482024: 3919%
- Imaging
- 2023: 162024: 176%
- Lab and pathology
- 2023: 302024: 1163%
- Surgery
- 2023: 122024: 0100%
Where Dr. Maack's Medicare services took place, 2024
- In an office17955%
- In a facility14945%
Dr. Maack compared with the California median for emergency medicine physicians, 2024
- Dr. Maack
- California median
- Medicare services
- 328vs 26524% above
- Medicare patients
- 287vs 24318% above
- Part D claims
- 73vs 6218% above
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Maack'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. Maack and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Joanna Sing-Ling Maack treated 287 Medicare patients in 2024, average age 75
CMS counts 287 Medicare patients who saw Dr. Maack in 2024. The largest group is 65 to 74, with 117 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 26% are also on Medicaid. Their average risk score is 1.45, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Maack's median patient age at 45, with 59% women.
Dr. Maack's Medicare patients by age, 2024
Dr. Maack's Medicare patients by sex, 2024
- Women17461%
- Men11339%
Chronic conditions among Dr. Maack's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis62%
- Ischemic heart disease36%
- Diabetes33%
- Anxiety29%
- Mood disorders28%
- Chronic kidney disease27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Maack's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Joanna Sing-Ling Maack wrote 168 Medicare Part D claims in 2024
In 2024, Dr. Maack wrote 168 Medicare Part D claims for 114 patients. 92% of them were for generic drugs. CMS names the drug for 73 of them, across 5 drugs with 11 or more claims each, at $442 in total drug cost. In 2023, CMS named 49 claims across 3 drugs.
Dr. Maack's Part D claims by kind of drug, 2024
- Generic155 claims92%
- Brand-name13 claims8%
Dr. Maack'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. Maack's Part D claims, 2024
- Antibiotics54%90 of 168 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: 492024: 7349%
Drugs named by CMS: 5 in 2024, 3 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. Joanna Sing-Ling Maack takes part in Medicare
Dr. Maack accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of nail tissue: 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)
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Dr. Joanna Sing-Ling Maack received $184 in industry payments from 2017 to 2021
CMS Open Payments shows 2 general payments to Dr. Maack from 2 drug and device companies from 2017 to 2021. Food and beverage make up the largest share, 100% of the total. Grifols Shared Services North America, Inc. paid the most, $125.
General payments to Dr. Maack by program year, 2017 to 2021
Companies that paid Dr. Maack the most, 2017 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Joanna Sing-Ling Maack graduated from Icahn School Of Medicine At Mount Sinai
Dr. Maack graduated from Icahn School Of Medicine At Mount Sinai in 2005.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Joanna Sing-Ling Maack accepts plans from 12 insurance carriers
Dr. Maack is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- United Healthcare
- Elevance
- Aetna
- Blue Cross Blue Shield of Michigan
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- +4 more carriersWith a free account
Plan types Dr. Maack accepts, by number of carriers
- PPO7
- HMO6
- EPO3
- Medicare2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Joanna Sing-Ling Maack'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 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) |
| 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. Joanna Sing-Ling Maack
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. Joanna Sing-Ling Maack's NPI number?
Dr. Joanna Sing-Ling Maack's NPI number is 1235381831. It was assigned on October 15, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Joanna Sing-Ling Maack?
Dr. Joanna Sing-Ling Maack is an emergency medicine physician in La Canada Flintridge, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Joanna Sing-Ling Maack practice?
Dr. Maack practices at 475 Foothill Blvd, La Canada Flintridge, CA 91011. Dr. Maack's primary practice is Exer Urgent Care in La Canada Flintridge, California. Dmand AI also links Dr. Maack to 2 medical groups and 1 home health agency.
What is Dr. Joanna Sing-Ling Maack's office phone number?
The practice phone on file for Dr. Maack is (818) 880-2225.
What is Dr. Joanna Sing-Ling Maack's medical license number?
Dr. Maack holds California license A109849, one of the licenses on file in 2 states.
Which states has Dr. Joanna Sing-Ling Maack been licensed in?
Dmand AI has state licenses on file for Dr. Maack in California (2009 to 2027) and New Jersey (2008 to 2013).
Which hospitals is Dr. Joanna Sing-Ling Maack affiliated with?
Dr. Maack is affiliated with Huntington Hospital.
What medical group is Dr. Joanna Sing-Ling Maack part of?
Dr. Maack is linked to Exer Urgent Care. Dmand AI links Dr. Maack to 2 more medical groups.
Does Dr. Joanna Sing-Ling Maack accept Medicare?
Yes. CMS data shows Dr. Maack billed Medicare for 328 services in 2024, and Dr. Maack accepts Medicare assignment.
How many Medicare patients does Dr. Joanna Sing-Ling Maack see?
CMS counts 287 Medicare patients who saw Dr. Maack in 2024, with an average age of 75.
Show 7 more questionsShow fewer questions
Is Dr. Joanna Sing-Ling Maack board certified?
Yes. Dr. Maack is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Joanna Sing-Ling Maack bill to Medicare?
In 2024, Dr. Maack's most billed Medicare services were emergency department visit (99285), office visit, new patient (99204) and office visit, established patient (99214).
Where did Dr. Joanna Sing-Ling Maack go to medical school?
Dr. Maack graduated from Icahn School Of Medicine At Mount Sinai in 2005.
What drugs does Dr. Joanna Sing-Ling Maack prescribe most?
In 2024 Medicare Part D data, Dr. Maack's most prescribed drugs by claims were Amoxicillin-Clavulanate Potass, Cephalexin and Azithromycin.
Has Dr. Joanna Sing-Ling Maack received payments from drug or device companies?
CMS Open Payments shows $184 in general payments to Dr. Maack from 2 companies from 2017 to 2021. The largest total came from Grifols Shared Services North America, Inc.
How long has Dr. Joanna Sing-Ling Maack been practicing?
Dr. Maack graduated from medical school in 2005, 21 years ago.
What insurance does Dr. Joanna Sing-Ling Maack accept?
Dr. Maack is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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