Nancy E. Siskowic, NP, CNS
Psychiatric/Mental Health Nurse Practitioner · Rolling Hills Estates, CA
Nancy E. Siskowic, NP, CNS is a psychiatric/mental health nurse practitioner with a practice address in Rolling Hills Estates, California, and NPI 1114133576, issued on May 15, 2007. Check the license (California RN139580, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Nancy E. Siskowic
- Credential
- NP, CNS
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License number
- RN139580 CA
Self-reported in NPPES; status is on the state search - Practice location
- 608 Silver Spur RD, Rolling Hills Estates, CA 90274
- Phone
- (310) 872-4640
- Enumerated
- May 15, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (310) 375-8415
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 4,226 in California → Look up another NPI →
Verify Nancy E. Siskowic in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license RN139580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average psychiatric/mental health nurse practitioner in 2024
289 Medicare Part D claims for 53 beneficiaries, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Estradiol (Twice Weekly)123 claims
- Progesterone73 claims
- Dotti48 claims
- Minivelle15 claims
- Escitalopram Oxalate12 claims
- Lyllana11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Nancy E. Siskowic among 4,226 psychiatric/mental health nurse practitioner records in California
Nancy E. Siskowic, NP, CNS is one of 4,226 psychiatric/mental health nurse practitioner records with a practice address in California. 62% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 4% of them.
- NPI issued2007 · 4% of these records are older, 93% newer
- In a Medicare fileYes · 62% of these records are
- In the CMS Doctors and Clinicians fileNo · 46% of these records are
- Record last updated2007 · 16% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LP0808X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatric/Mental Health Nurse Practitioner providers in California
There are 4,226 psychiatric/mental health nurse practitioner records in California.
All 4,226 in California → Every provider in Rolling Hills Estates → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Marie Earvolino-Ramirez, NPRancho Palos Verdes, CA 902751346014867
- Allison Lai, NP, RNRancho Palos Verdes, CA 902751619713831
- Canybec Sulayman, NPRancho Palos Verdes, CA 902751225868623
- Christy ZeegenPacific Palisades, CA 902721639784291
- Hayley Kincaid, NPRedondo Beach, CA 902771730814484
- Kathleen McDermott, DNP, PMHNP-BCRedondo Beach, CA 902771760637474
- Christene McLarty, NPRedondo Beach, CA 902771518216548
- Michele Pickerell, NURSE PRACTITIONERRedondo Beach, CA 902771639950843
Common questions
What is Nancy E. Siskowic, NP, CNS's NPI number?
Nancy E. Siskowic, NP, CNS's National Provider Identifier (NPI) is 1114133576, issued on May 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy E. Siskowic, NP, CNS located?
The NPPES record lists a practice address at 608 Silver Spur RD, Rolling Hills Estates, CA, 90274. Phone: (310) 872-4640. Providers update this record themselves, so call before visiting.
How can I verify Nancy E. Siskowic, NP, CNS's license?
NPPES lists California license number RN139580, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Nancy E. Siskowic, NP, CNS prescribe under Medicare Part D?
In 2024, Nancy E. Siskowic, NP, CNS had 289 Medicare Part D claims for 53 beneficiaries; the average among psychiatric/mental health nurse practitioner prescribers was 906. Part D covers Medicare prescriptions 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.