Are you Margarita C. Castro-Zarraga, M.D.? This profile is yours to edit: update your address, phone, photo and services.
Edit this profileWhere to find Margarita C. Castro-Zarraga, M.D.
- Lowell location main office
161 Jackson St, Lowell, MA 01852 - Fitchburg location
275 Nichols Rd, Fitchburg, MA 01420
About Dr. Castro-Zarraga
Margarita C. Castro-Zarraga, M.D. is a healthcare provider in Lowell, MA specializing in family practice. Margarita is also listed as specializing in family medicine. Medicare claims data shows Margarita provided 32 services to 25 patients. The services billed most often include hemoglobin a1c level. This provider record is associated with NPI 1578705679.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (978) 937-9700
- Email not available
Practice Locations
161 JACKSON ST
Lowell, MA 01852
275 Nichols Rd
Fitchburg, MA 01420
Conditions Commonly Evaluated or Treated
Within Family Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
Digestive
Genitourinary and reproductive
- Erectile dysfunction
- Heavy periods
Musculoskeletal and pain
Neurologic and behavioral
Respiratory and infectious
- Acute bronchitis
- Asthma
- Sinus infection
Skin
Common childhood and ear conditions
- Ear infection
- Pink eye
Pain & Joints
- Arthritis
- Back pain
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive interventions
- Birth control counseling
- Smoking cessation counseling
Screening and testing
- Cholesterol screening
- Depression screening
- Diabetes and prediabetes screening
- EKG
Diagnostic Tests
- COVID-19 testing
- Rapid Strep and Flu Swabs
- Urine Drug Screen
Exams & Screenings
- Camp and School Physical
- Pre-Op Clearance Exam
Foot and Leg Pain
- Toenail Fungus Treatment
Heart & Circulation
Injections
- Immunotherapy
- Vitamin B12 Injections
Lungs & Breathing
- Pulmonary function test
Minor Procedures
- Burn and Wound Care
- Ingrown toenail removal
- Suture removal
Occupational Health
- DOT Physical
Office procedures
- Earwax removal
- Incision and drainage of an abscess
- Superficial foreign-body removal
Pain Management
- Joint injections
Preventive Care
- Chronic Illness Checkup
- Routine Vaccines
- Travel Vaccines And Consult
Respiratory
- Breathing Treatment
Senior Care
Sexual & Reproductive Health
- STD Swabs and Screening
Skin Procedures
- Cyst Removal
- Precancerous Sun Spot Freezing
- Skin Tag Removal
- Wart Removal
Sleep Health
- At-Home Sleep Study Order
Urgent Care Procedures
- Stitches and Laceration Repair
Wellness & Weight
- Weight Management Consult
Women's Health
- Hormone Replacement Therapy Consultation
Procedures Most Often Billed to Medicare
32 services · 25 patients · 1 distinct code
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Hemoglobin a1c level | Lab test | 83036 |
32 | As often as other peers in Family Practice |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other family practices at this location 3
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other family practices in Lowell 5
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2005 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Margarita C. Castro-Zarraga specialize in?
Margarita C. Castro-Zarraga is a family practice in Lowell, MA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Margarita C. Castro-Zarraga located?
Margarita C. Castro-Zarraga is listed at 161 Jackson St, Lowell, MA 01852. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Margarita C. Castro-Zarraga's phone number?
The number on file is (978) 937-9700. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Margarita C. Castro-Zarraga?
Margarita C. Castro-Zarraga's National Provider Identifier is 1578705679. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Margarita C. Castro-Zarraga train?
Margarita C. Castro-Zarraga attended Other, graduating in 2005. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Margarita C. Castro-Zarraga have?
Margarita C. Castro-Zarraga has 21 years experience. Calculated from a graduation year of 2005, reported in the CMS National Downloadable File.
CMS public data
What does Margarita C. Castro-Zarraga do most often?
According to Medicare billing data, Margarita C. Castro-Zarraga the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Margarita C. Castro-Zarraga's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Margarita C. Castro-Zarraga. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.