ZACHARY THOMAS FELLOWS M.D.
NPI 1154733152
Internal Medicine - Rheumatology in Carlsbad, CA

Active since May 24, 2014PECOS EnrolledAccepts Medicare Assignment
80.73/100
CMS Quality Rating
6120 PASEO DEL NORTE STE L2, CARLSBAD, CA 92011(760) 891-4687(760) 684-8715 Get Directions Write a Review

NPPES record last updated: January 18, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jan 18, 2026, Jul 8, 2024, Sep 23, 2020 and 2 more (5 updates tracked since 2016).

About Zachary Thomas Fellows M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ZACHARY THOMAS FELLOWS M.D. (NPI 1154733152) is an individual rheumatology provider in Carlsbad, California, licensed in California (A144510) and active in the NPI registry since May 2014. He is enrolled in Medicare PECOS and is a graduate of Other (2014).

NPPES Registry Identity

NPI1154733152
Entity TypeIndividualMale
Primary Taxonomy207RR0500X
Provider Legal NameZACHARY THOMAS FELLOWSCredential: M.D.
Location Address6120 PASEO DEL NORTE STE L2Carlsbad, CA 92011-1149
Mailing Address6120 Paseo Del Norte Ste L2Carlsbad, CA 92011-1149 · (760) 891-4687 · Fax (760) 684-8715
Fax(760) 684-8715
Sole ProprietorNo
Medical School CMSOtherGraduated 2014
Enumeration DateMay 24, 2014
Last NPPES UpdateJanuary 18, 20265 updates tracked since enumeration
NPPES CertifiedJanuary 18, 2026
NPI 1154733152 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians
Taxonomy Code207RR0500X
License Licensed in CA · A144510
Definition
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
Also ListedInternal MedicineTaxonomy 207R00000X · License A144510 (CA)
Also ListedInternal Medicine · Obesity MedicineTaxonomy 207RB0002X · License A144510 (CA)
6120 PASEO DEL NORTE STE L2, Carlsbad, CA 92011

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Zachary Thomas Fellows M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID941580708
PECOS Enrollment IDI20200619001047
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, golimumab, 1 mg, for intravenous use J1602
Golimumab is a medication given through an IV (a small tube in your vein). It helps to reduce inflammation and pain by blocking a protein in your body that causes inflammation. It's often used to treat conditions like rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis.
3,050 services12 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
248 services151 patients
Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301
Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.
72 services18 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
62 services35 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
57 services57 patients
Limited ultrasound scan of joint or other extremity structure except blood vessels 76882
A limited ultrasound scan of a joint or other extremity structure lacking blood vessels is a non-invasive procedure that uses sound waves to create images of the inside of your body. This helps in diagnosing and monitoring conditions related to your joints or other similar structures.
47 services26 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92011 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$140.22 typical visit price
range $62.10 – $184.71
Typical copayment $35.05 (range $15.52 – $46.17)
Most-billed visit code 99204
Established Patient
$108.42 typical visit price
range $20.62 – $151.42
Typical copayment $27.10 (range $5.15 – $37.85)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.73/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Individually scored
Quality80.22
Promoting Interoperability100
Improvement Activities40
Cost55.54

Reported Quality Measures

Documentation of Current Medications in the Medical Record
100%3,097 patients5/55-star benchmark: 100%
Gout: Serum Urate Target
54%35 patients
Hepatitis B Safety Screening
68%76 patients
Provide Patients Electronic Access to Their Health Information
92%604 patients4/55-star benchmark: 100%
Safe Hydroxychloroquine Dosing
76%159 patients
Screening for Osteoporosis for Women Aged 65-85 Years of Age
51%228 patients3/55-star benchmark: 98%
Tuberculosis Screening Prior to First Course of Biologic and/or Immune Response Modifier Therapy
93%55 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Internal Medicine (Rheumatology)
6120 PASEO DEL NORTE STE L2
CARLSBAD, CA 92011
Registered Nurse
6120 PASEO DEL NORTE STE L2
CARLSBAD, CA 92011

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Zachary Fellows's NPI number?

The NPI number for Zachary Fellows is 1154733152. It was assigned to this individual provider in the NPPES registry on May 24, 2014.

Where is Zachary Fellows located?

Zachary Fellows practices at 6120 Paseo Del Norte Ste L2, Carlsbad, CA 92011. The listed phone number is (760) 891-4687.

What is Zachary Fellows's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Is Zachary Fellows enrolled in Medicare?

Yes. Zachary Fellows is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Zachary Fellows was last updated on January 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.