Marjolein S. Sieczkowski, LCSW
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2018
- Practice address
- 2469 W Zepher Ave, Flagstaff, AZ 86001
- Practice phone
- Call (480) 630-0316
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kelli Sieczkowski - Flagstaff
Behavioral health facility · Flagstaff, Arizona
Find Marjolein Sieczkowski'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.
Marjolein S. Sieczkowski is a clinical social worker in Flagstaff, Arizona
Marjolein Sieczkowski practices at Kelli Sieczkowski - Flagstaff in Flagstaff, Arizona.
Marjolein Sieczkowski's NPI, 1457850984, was assigned on February 10, 2018. Marjolein Sieczkowski holds Arizona license LCSW-16963.
- NPI
- 1457850984NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8729341813
- NPI enumeration date
- February 10, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (480) 630-0316
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Doctors and Clinicians National Downloadable File (CMS)
Marjolein S. Sieczkowski practices at Kelli Sieczkowski - Flagstaff in Flagstaff, Arizona
Marjolein Sieczkowski's primary practice is Kelli Sieczkowski - Flagstaff, at 2469 W Zepher Ave, Flagstaff, AZ 86001. The practice phone is (480) 630-0316.
- Kelli Sieczkowski - Flagstaff2469 W Zepher Ave, Flagstaff, AZ 86001Phone(480) 630-0316
Source: Doctors and Clinicians National Downloadable File (CMS)
Marjolein S. Sieczkowski is affiliated with 1 site of care and 1 medical group
Marjolein Sieczkowski's primary practice is Kelli Sieczkowski - Flagstaff in Flagstaff, Arizona. The medical group on file is Positive Change Counseling.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Marjolein S. Sieczkowski's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Marjolein Sieczkowski practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kelli Sieczkowski - Flagstaff | Available with a free account |
Source: Dmand AI Technology Install Data
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Marjolein S. Sieczkowski is one of 1,030 clinical social workers in Arizona
Social worker is Marjolein Sieczkowski's primary specialty in the NPI Registry, under taxonomy code 1041C0700X. The record also lists clinical. Marjolein Sieczkowski is licensed in Arizona.
Specialties and state licenses
- Clinical social worker, ArizonaPrimary
Clinical social workers near Marjolein Sieczkowski
Counts of clinical social workers 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
Marjolein S. Sieczkowski's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Marjolein Sieczkowski's median patient age at 69, with 100% women.
Marjolein Sieczkowski's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
How Marjolein S. Sieczkowski takes part in Medicare
Marjolein Sieczkowski 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)
Sources for Marjolein S. Sieczkowski'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 | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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 Marjolein S. Sieczkowski
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What is Marjolein S. Sieczkowski's NPI number?
Marjolein S. Sieczkowski's NPI number is 1457850984. It was assigned on February 10, 2018, and it is active in the NPI Registry.
What does Marjolein S. Sieczkowski specialize in?
Marjolein S. Sieczkowski is a clinical social worker in Flagstaff, Arizona. The primary specialty in the NPI Registry is Clinical Social Worker (taxonomy code 1041C0700X).
Where does Marjolein S. Sieczkowski practice?
Marjolein Sieczkowski practices at 2469 W Zepher Ave, Flagstaff, AZ 86001. Marjolein Sieczkowski's primary practice is Kelli Sieczkowski - Flagstaff in Flagstaff, Arizona.
What is Marjolein S. Sieczkowski's office phone number?
The practice phone on file for Marjolein Sieczkowski is (480) 630-0316.
What is Marjolein S. Sieczkowski's medical license number?
Marjolein Sieczkowski holds Arizona license LCSW-16963.
What medical group is Marjolein S. Sieczkowski part of?
Marjolein Sieczkowski is linked to Positive Change Counseling.
Does Marjolein S. Sieczkowski accept Medicare?
Yes. CMS lists Marjolein Sieczkowski as accepting Medicare assignment.
How long has Marjolein S. Sieczkowski been practicing?
Marjolein Sieczkowski graduated from medical school in 2009, 17 years ago.
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