Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Isabel Charlotte Diamond Allen, DNP, FNP, RN

Individual provider Registered Nurse · NPI 1164190823

Isabel Charlotte Diamond Allen, DNP, FNP, RN is a Nurse Practitioner in Carlsbad, California. Qualified in 2023, 3 years ago. Practices with Hardison Medical Corporation, a 13-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
3
Licensed in
CA
In the registry since
2021
Specialties on file
2
What do these letters mean?
DNP — Doctor of Nursing Practice
The highest clinical degree in nursing.
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.

See every abbreviation used in this directory →

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Practice location Address checks out

6520 Ambrosia Ln Apt 1218
Carlsbad, CA 92011-2616
Phone: (520) 904-5414
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 95029019 (CA)
Registered Nurse Taxonomy 163W00000X · Licence 95167811 (CA)

Record details

NPI number1164190823
Entity typeIndividual (Type 1)
GenderFemale
Credentials DNP , FNP , RN
Sole proprietorNo
NPI enumeratedAugust 30, 2021
Last updated in NPPESFebruary 9, 2024
Certification dateFebruary 9, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2023 (3 years in practice)
Group practice Hardison Medical Corporation — 13 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients124
Services billed 273 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Hardison Medical Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 13 clinicians in the practice; 11 are shown here.

Other providers in Carlsbad