Before you start

A CURP
Temporary or permanent residency to buy voluntary IMSS — visitor permits do not qualify
A formal employment contract for employer-paid IMSS
Budget of roughly USD 100–300 per adult per month for a domestic private policy

Step-by-step

1
Let your employer enrol you in IMSS
Mexican employers must register new hires with IMSS within days, whatever private cover you already hold. Ask HR to confirm your NSS and which Unidad de Medicina Familiar you have been assigned to, then register on IMSS Digital so you can book appointments and pull your own records. The automotive employers here do this as a matter of routine.
Via employerWho: Your employer registers youWithin the first days of employmentAn employee share of roughly 2–3% of salary
2
Buy voluntary IMSS if nobody employs you here
Seguro de Salud para la Familia is the self-purchased public option. Apply with CURP, resident card and proof of address, pay the annual premium at a bank — annual and in advance, no monthly option — and cover begins on the first of the following month. Cheap and a genuine floor, but read the exclusions before relying on it.
In personWho: Self-employed, remote workers, non-working residentsDays to process; cover starts the 1st of the next monthAn age-scaled annual premium: about MXN 9,300 under 20, MXN 12,350 in your thirties and MXN 19,800 in your sixties in 2026
3
Add a private policy and use the local hospitals rather than reflexively going to Mexico City
GNP, AXA, MetLife and Mapfre write domestic policies, and the premium tier decides your hospital network. Puebla's private hospitals are good and materially cheaper than the capital's, which matters because premiums are priced by network. Expect medical underwriting and permanent exclusion of pre-existing conditions.
OnlineWho: YouOne to two weeks to underwrite≈USD 100–300 per adult per month for a domestic plan
4
Know that the teaching hospitals are a real resource
BUAP's university hospital and the IMSS and ISSSTE specialty centres in the city give Puebla more specialist depth than most Mexican cities its size, and the medical schools mean a steady supply of consultants who trained here and stayed. For a complicated diagnosis this is a genuine alternative to travelling to Mexico City rather than a fallback.
In personWho: AnyoneReferral-driven
5
Have an ash plan if anyone in the household has a respiratory condition
Fine volcanic ash irritates airways and aggravates asthma and COPD, and it reaches the city several times a year with little warning. Keep FFP2-grade masks in the house, keep windows shut and the air conditioning on recirculate on ash days, and have a rescue inhaler supply that does not depend on getting to a pharmacy that morning. The daily CENAPRED bulletin is the thing to check, not social media.
In personWho: Anyone with a respiratory conditionSeveral times a year
6
Use pharmacy consultorios for anything minor
Farmacias Similares and Farmacias del Ahorro run walk-in doctors' offices attached to the shop for roughly MXN 50–80, no appointment and no insurance. For a chest infection, a UTI or a prescription refill this is what locals do, and it works from your first day in the country.
In personWho: Anyone≈MXN 50–80 per consultation

Documents you’ll need

CURP
Resident card
NSS, assigned via your employer or requested on IMSS Digital
Comprobante de domicilio, used to assign your IMSS clinic
Private policy details, to carry on you

Things most newcomers don’t know

Puebla's medical-school density buys you specialist depth that a city of this size normally does not have.

Three universities run medical faculties here and the public system has teaching and specialty hospitals attached to them, so consultants train, practise and stay. The practical effect is shorter waits to see a specialist privately and lower prices than Mexico City, an hour and a half away. Newcomers default to travelling to the capital for anything serious and frequently do not need to.

Source: community-reported / BUAP

Ash is a respiratory issue for a minority and a nuisance for everyone, and the difference matters.

For most people an ash day means closing the windows. For someone with asthma, COPD or a small child with reactive airways it is a genuine exposure, and the fine fraction penetrates deeply. The mitigation is cheap and has to be in the house before the morning it is needed — proper masks, a plan for keeping indoor air clean, and medication in hand rather than in a pharmacy across town.

Source: CENAPRED / Secretaría de Salud

Voluntary IMSS permanently excludes major pre-existing conditions, not merely defers them.

Seguro de Salud para la Familia carries waiting periods for many conditions and outright, permanent exclusions for others — malignant tumours, congenital conditions, chronic degenerative disease, HIV, psychiatric illness and addiction among them. IMSS also declines applicants who already have one and can refuse treatment later if it was not declared. People buy it as a safety net and find the hole is exactly where their diagnosis sits.

Source: IMSS

Private premiums are cheap by foreign standards but underwriting is strict, and it gets stricter with age.

A domestic Mexican policy costs a fraction of a US plan, which is why nearly every relocating professional buys one. What newcomers underestimate is that insurers medically underwrite at entry and permanently exclude anything you already have — and that new policies become harder and dearer in your sixties. Buying while healthy, ideally before you arrive, is worth far more than shopping on price later.

Source: Mexperience / ExpatDen

Common mistakes to avoid

Assuming voluntary IMSS will cover a pre-existing condition — the exclusions are permanent.
Buying a private policy after a diagnosis rather than before arriving.
Defaulting to Mexico City for specialist care without checking what Puebla has.
Reaching an ash day without masks or a medication buffer for a respiratory condition.
Going to a hospital for a minor complaint instead of a MXN 50–80 pharmacy consultorio.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.