WASHINGTON — The Trump administration’s move to suspend billions of dollars in payments that insurers expect under the Affordable Care Act injects new uncertainty into the health law’s insurance markets right as the companies are making decisions about next year’s rates.

The Centers for Medicare and Medicaid Services said Saturday it was forced to halt further collections or payments under the ACA program known as risk adjustment, because of a federal judge’s ruling. Initially, the decision could affect $10.4 billion in payments tied to the 2017 benefit year, which were scheduled to flow this fall.