Mark H. Nienaber, LCSW
Clinical Social Worker · Baton Rouge, LA
Mark H. Nienaber, LCSW is a clinical social worker with a practice address in Baton Rouge, Louisiana, and NPI 1033410899, issued on Nov 10, 2010. Check the license (Louisiana 5341, as entered in NPPES) with the Louisiana board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark H. Nienaber
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- 5341 LA
Self-reported in NPPES; status is on the state search - Practice location
- 4615 Government St, Baton Rouge, LA 70806
- Phone
- (225) 925-1906
- Enumerated
- Nov 10, 2010
- Record last updated
- Jun 6, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (225) 362-5356
- Medicare enrollment
- Enrolled (PECOS I20131223001144); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 3,178 in Louisiana → Look up another NPI →
Also registered at 4615 Government St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lynette Adams, RNPsychiatric/Mental Health Registered Nurse1942353610
- Tameka Anderson, RNRegistered Nurse1588940613
- Melissa AndrusSocial Worker1144642562
- Qiana Armstead, RNRegistered Nurse1407132681
- Brandi Babin, MSWSocial Worker1881841328
- Vada BakerCounselor1649692872
Verify Mark H. Nienaber in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Louisiana board licenses this profession
Search for license 5341Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Capital Area Human Services DistrictGonzales, LA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark H. Nienaber among 3,178 clinical social worker records in Louisiana
Mark H. Nienaber, LCSW is one of 3,178 clinical social worker records with a practice address in Louisiana. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 32% of them.
- NPI issued2010 · 32% of these records are older, 64% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 16% of these records are
- Graduated2000 · median 2005 among the 512 with a school on file
- Record last updated2018 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Louisiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
485 clinical social worker records list a practice address in Baton Rouge
They are 485 of the 12,526 NPPES records with a practice address in Baton Rouge, and 3,178 clinical social worker records in Louisiana.
All 3,178 in Louisiana → Every provider in Baton Rouge → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Stephen Aguillard, LCSWBaton Rouge, LA 708061821158924
- Nina Barbin, LCSWBaton Rouge, LA 708061902841216
- Juliet Catrett, LCSWBaton Rouge, LA 708061407862311
- Holly Davis, LCSWBaton Rouge, LA 708061215097225
- Carolyn Ellender, LCSWBaton Rouge, LA 708061942238548
- Kelle Grezaffi, LCSWBaton Rouge, LA 708061821158809
- Michele Hornsby, LCSWBaton Rouge, LA 708061013952290
- Michele McCaskill, LCSW-BACSBaton Rouge, LA 708061730249780
Common questions
What is Mark H. Nienaber, LCSW's NPI number?
Mark H. Nienaber, LCSW's National Provider Identifier (NPI) is 1033410899, issued on Nov 10, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Mark H. Nienaber, LCSW located?
The NPPES record lists a practice address at 4615 Government St, Baton Rouge, LA, 70806. Phone: (225) 925-1906. Providers update this record themselves, so call before visiting.
How can I verify Mark H. Nienaber, LCSW's license?
NPPES lists Louisiana license number 5341, as entered by the provider. Search the Louisiana board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.