IMSS voluntary enrollment for expats in Mexico: 2026 cost by age and exclusions

Published November 4, 2026

How foreign residents enroll in IMSS's voluntary family health insurance, what it costs by age from March 2026, which pre-existing conditions block enrollment and what is never covered.

Expats who hold temporary or permanent residency in Mexico can enroll voluntarily in IMSS, Mexico's main public health system, through a plan called the Seguro de Salud para la Familia (family health insurance). You pay one fee a year, in advance, set by age. From March 1, 2026 it runs from MXN 9,300 for under-20s to MXN 22,150 for people 80 and over, and MXN 20,600 a year at ages 60 to 69. Coverage starts on the first day of the month after you enroll. The catch is underwriting. IMSS turns away applicants with a list of serious pre-existing conditions, makes some treatments wait six months to two years, and never covers some things at all, including glasses, hearing aids and most dental work.

What IMSS voluntary enrollment is

The Seguro de Salud para la Familia (procedure IMSS-02-014) is for people in Mexico who have no other social security scheme, such as employer-paid IMSS. It gives access to IMSS medical, surgical, pharmacy and hospital care at IMSS's own clinics and hospitals. You can enroll as an individual or as a family group, at any time of year, online or in person. It is not private insurance. You are assigned to a family medicine unit (UMF) near your address, and specialist care normally comes by referral from there.

IMSS cost in 2026 by age

IMSS's Technical Council updates the fees every year. These are the official annual amounts that apply to new enrollments and renewals from March 1, 2026:

Age group	Annual fee (MXN), from March 1, 2026
0 to 19	9,300
20 to 29	11,550
30 to 39	12,350
40 to 49	14,350
50 to 59	14,850
60 to 69	20,600
70 to 79	21,500
80 and over	22,150

A family's fee is the sum of each member's age-band fee. For example, a retired couple aged 64 and 67 would pay MXN 41,200 for the year. The fee is paid once a year in advance, and IMSS states that it does not refund payments in whole or in part.

Who can enroll

To enroll, each person needs:

A CURP (Mexico's population registry number). Foreign residents usually get one when INM issues their resident card.
An NSS (IMSS social security number), which you can request online from IMSS with your CURP.
A personal email address.
Answers to IMSS's medical questionnaire, completed for each person being insured.

In person, the head of the family group also brings valid official ID and proof of address, each with one copy. In practice that means a resident card, so visitors on a tourist permit are not the target of this scheme. If you are still getting residency, see the Mexico temporary resident visa guide.

How to enroll, step by step

Get your CURP and NSS for everyone you will insure.
Choose online or in person. First-time enrollment can be done on IMSS's digital services portal. For the counter, go to the IMSS Subdelegación for your address, Monday to Friday, 8:00 to 15:30.
Complete the medical questionnaire honestly for each person.
Pay the annual fee at a bank using the payment reference IMSS gives you. A Mexican account makes this easier; see the guide to opening a bank account in Mexico as an expat.
Register at your clinic. Once you are enrolled, you sign up at your assigned UMF, where staff typically run a basic intake. Services start on the first day of the following month.
Diarise the renewal. You can renew in the 30 days before your year ends. IMSS doesn't send you a bill.

Pre-existing conditions that block enrollment

This is where older guides disagree, so here is what IMSS's own procedure page says. You cannot be insured if you have pre-existing conditions such as:

Malignant tumours.
Chronic degenerative disease, such as late complications of diabetes.
Storage diseases (for example Gaucher disease).
Chronic liver disease or chronic kidney failure.
Heart valve disease, heart failure, or after-effects of ischaemic heart disease (arrhythmia, angina or heart attack).
COPD with respiratory failure.
Chronic systemic connective tissue disease.
Addictions, including alcoholism.
Mental disorders such as psychosis and dementia.
Congenital diseases.
HIV or AIDS.

IMSS words the list as "among others", so it is not exhaustive. Common conditions that are well controlled and not on the list, such as ordinary high blood pressure, are not named as exclusions. If you have something borderline, ask at your Subdelegación before you pay, because the fee is not refundable. IMSS also points to article 314 of the Social Security Law: getting benefits through deception counts as fraud.

Waiting periods

Article 83 of the IMSS affiliation regulation sets waiting periods, counted from the date you are enrolled, before these treatments are covered:

Waiting period	Treatments
6 months	Benign breast tumour
10 months	Childbirth
1 year	Lithotripsy; gynaecological surgery (except uterine, ovarian or perineal cancers); varicose vein surgery; sinus and nose surgery; varicocele surgery; haemorrhoid, rectal fistula and prolapse surgery; tonsil and adenoid removal; hernia surgery (except spinal disc); bunion (hallux valgus) surgery; strabismus surgery
2 years	Orthopaedic surgery

The regulation is clear that a waiting period on one treatment doesn't stop you using IMSS for anything else in the meantime.

What IMSS voluntary insurance never covers

Article 84 of the same regulation lists exclusions for voluntary enrollees:

Cosmetic surgery.
Glasses, contact lenses, intraocular lenses and hearing aids.
Surgery to correct astigmatism, presbyopia, myopia or hyperopia.
Treatment of self-inflicted injuries.
Injuries from professional sport.
Preventive medical check-ups requested by the insured person.
Behaviour and learning disorders.
Dental treatment other than extractions, fillings and cleaning.
Orthoses, prostheses and special devices.
Treatment of chronic conditions requiring permanent therapeutic control.
Fertility treatment.
After-effects of injuries or degenerative and vascular diseases acquired before enrollment.

Read the chronic-condition line carefully if you rely on long-term medication. The regulation does not spell out how it applies to conditions that start after you enroll, so ask IMSS directly about your situation.

IMSS vs private insurance in Mexico

	IMSS voluntary	Private or international insurance
Price	Fixed national fee by age band, MXN 9,300 to 22,150 a year in 2026	Priced by insurer, age, plan and deductible; usually rises steeply after 60
Pre-existing conditions	Listed conditions block enrollment; others may face waiting periods	Each insurer underwrites differently; exclusions or loadings are common
Where you are treated	IMSS clinics and hospitals, with GP referral to specialists	Private hospitals and doctors in the insurer's network
Language	Spanish	English-speaking providers more common in expat areas
Main drawbacks	Waits, bureaucracy, distance to IMSS hospitals in small towns	Cost, deductibles and age caps on new policies

Many expats use both. IMSS works as a low-cost catastrophic backstop, with routine visits paid in cash at private clinics or covered by a private plan. Medicare does not pay for care in Mexico, so US retirees in particular should plan for one or both.

What people who've done it say

Long-term users are mostly satisfied but still pay for extras. In a 2026 Expat.com thread, a British resident of Mérida said they had used IMSS "for a long time" and were satisfied. They still paid out of pocket for some things, including a colonoscopy and eye care, and used a local patient-assistance service to get to appointments and translate. In the same thread, a member in their 50s in Saltillo said they pay cash for routine care and were weighing catastrophic cover. Another commented that private cover gets harder to find with age, which is why many older expats rely on IMSS. Read the thread.
Check where the nearest IMSS hospital actually is. In an older Expat.com thread from about 2019, a bilingual healthcare advisor in San Miguel de Allende noted that the town then had only a small IMSS clinic. Specialist appointments meant a referral and a trip to the IMSS hospital in Celaya. A couple in the same thread said they had chosen to keep their IMSS voluntary cover after being told routine check-ups were no longer included. Read the thread.
Get advice on borderline conditions before you pay. When an applicant asked on Expat.com (about 2019) whether sleep apnea would block enrollment, a health advisor pointed out that COPD with respiratory failure is on IMSS's exclusion list with no waiting-period route, so it would likely be a permanent exclusion. The advisor recommended a bilingual helper who handles IMSS enrollments. Read the thread.
A missed renewal can lock you out for good. A BajaNomad member described enrolling an elderly parent in IMSS after a brief exam. During the year the parent was diagnosed with a heart condition and hospitalized for a week. The family hadn't realized IMSS sends no renewal notice, the cover lapsed during that hospital stay, and IMSS refused to re-enroll the parent because the heart condition was now pre-existing. The post dates from 2014, but the renewal rules work the same way today. Read the thread.

Common mistakes

Leaving conditions off the questionnaire. IMSS stresses that the information on pre-existing conditions must be correct and complete. Fees are not refunded and deception can be treated as fraud.
Expecting cover the day you pay. Services begin on the first of the following month, and waiting periods then apply to the treatments listed above.
Missing the renewal. Renew in the 30 days before expiry. IMSS allows a late renewal up to 45 days after expiry only in limited circumstances tied to a condition arising during the year, so don't rely on it.
Assuming it covers everything. Glasses, hearing aids, prostheses and most dental work are excluded, as are check-ups you request yourself.
Ignoring geography. A clinic near home doesn't mean a hospital near home. Find out which IMSS hospital your UMF refers to.
Dropping private cover too early. If you are switching from private insurance, keep it until IMSS cover is active and any waiting periods that matter to you have passed.

Bottom line

For a resident in good health, IMSS voluntary enrollment is the cheapest serious health cover in Mexico. In 2026 it costs MXN 14,850 a year at ages 50 to 59 and MXN 20,600 at 60 to 69, at a fixed national price. Enroll while you are healthy, because the exclusion list is strict and the fee is not refundable. Renew on time every year, and plan to pay separately for dental, vision and anything excluded by article 84. Many expats pair IMSS with a private plan or cash payments for routine care, and use IMSS as protection against a large hospital bill.